prototype.172.js

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/*  Prototype JavaScript framework, version 1.7.2
 *  (c) 2005-2010 Sam Stephenson
 *
 *  Prototype is freely distributable under the terms of an MIT-style license.
 *  For details, see the Prototype web site: http://www.prototypejs.org/
 *
 *--------------------------------------------------------------------------*/
 
var Prototype = {
 
  Version: '1.7.2',
 
  Browser: (function(){
    var ua = navigator.userAgent;
    var isOpera = Object.prototype.toString.call(window.opera) == '[object Opera]';
    return {
      IE:             !!window.attachEvent && !isOpera,
      Opera:          isOpera,
      WebKit:         ua.indexOf('AppleWebKit/') > -1,
      Gecko:          ua.indexOf('Gecko') > -1 && ua.indexOf('KHTML') === -1,
      MobileSafari:   /Apple.*Mobile/.test(ua)
    }
  })(),
 
  BrowserFeatures: {
    XPath: !!document.evaluate,
 
    SelectorsAPI: !!document.querySelector,
 
    ElementExtensions: (function() {
      var constructor = window.Element || window.HTMLElement;
      return !!(constructor && constructor.prototype);
    })(),
    SpecificElementExtensions: (function() {
      if (typeof window.HTMLDivElement !== 'undefined')
        return true;
 
      var div = document.createElement('div'),
          form = document.createElement('form'),
          isSupported = false;
 
      if (div['__proto__'] && (div['__proto__'] !== form['__proto__'])) {
        isSupported = true;
      }
 
      div = form = null;
 
      return isSupported;
    })()
  },
 
  ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script\\s*>',
  JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,
 
  emptyFunction: function() { },
 
  K: function(x) { return x }
};
 
if (Prototype.Browser.MobileSafari)
  Prototype.BrowserFeatures.SpecificElementExtensions = false;
/* Based on Alex Arnell's inheritance implementation. */
 
var Class = (function() {
 
  var IS_DONTENUM_BUGGY = (function(){
    for (var p in { toString: 1 }) {
      if (p === 'toString') return false;
    }
    return true;
  })();
 
  function subclass() {};
  function create() {
    var parent = null, properties = $A(arguments);
    if (Object.isFunction(properties[0]))
      parent = properties.shift();
 
    function klass() {
      this.initialize.apply(this, arguments);
    }
 
    Object.extend(klass, Class.Methods);
    klass.superclass = parent;
    klass.subclasses = [];
 
    if (parent) {
      subclass.prototype = parent.prototype;
      klass.prototype = new subclass;
      parent.subclasses.push(klass);
    }
 
    for (var i = 0, length = properties.length; i < length; i++)
      klass.addMethods(properties[i]);
 
    if (!klass.prototype.initialize)
      klass.prototype.initialize = Prototype.emptyFunction;
 
    klass.prototype.constructor = klass;
    return klass;
  }
 
  function addMethods(source) {
    var ancestor   = this.superclass && this.superclass.prototype,
        properties = Object.keys(source);
 
    if (IS_DONTENUM_BUGGY) {
      if (source.toString != Object.prototype.toString)
        properties.push("toString");
      if (source.valueOf != Object.prototype.valueOf)
        properties.push("valueOf");
    }
 
    for (var i = 0, length = properties.length; i < length; i++) {
      var property = properties[i], value = source[property];
      if (ancestor && Object.isFunction(value) &&
          value.argumentNames()[0] == "$super") {
        var method = value;
        value = (function(m) {
          return function() { return ancestor[m].apply(this, arguments); };
        })(property).wrap(method);
 
        value.valueOf = (function(method) {
          return function() { return method.valueOf.call(method); };
        })(method);
 
        value.toString = (function(method) {
          return function() { return method.toString.call(method); };
        })(method);
      }
      this.prototype[property] = value;
    }
 
    return this;
  }
 
  return {
    create: create,
    Methods: {
      addMethods: addMethods
    }
  };
})();
(function() {
 
  var _toString = Object.prototype.toString,
      _hasOwnProperty = Object.prototype.hasOwnProperty,
      NULL_TYPE = 'Null',
      UNDEFINED_TYPE = 'Undefined',
      BOOLEAN_TYPE = 'Boolean',
      NUMBER_TYPE = 'Number',
      STRING_TYPE = 'String',
      OBJECT_TYPE = 'Object',
      FUNCTION_CLASS = '[object Function]',
      BOOLEAN_CLASS = '[object Boolean]',
      NUMBER_CLASS = '[object Number]',
      STRING_CLASS = '[object String]',
      ARRAY_CLASS = '[object Array]',
      DATE_CLASS = '[object Date]',
      NATIVE_JSON_STRINGIFY_SUPPORT = window.JSON &&
        typeof JSON.stringify === 'function' &&
        JSON.stringify(0) === '0' &&
        typeof JSON.stringify(Prototype.K) === 'undefined';
 
 
 
  var DONT_ENUMS = ['toString', 'toLocaleString', 'valueOf',
   'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable', 'constructor'];
 
  var IS_DONTENUM_BUGGY = (function(){
    for (var p in { toString: 1 }) {
      if (p === 'toString') return false;
    }
    return true;
  })();
 
  function Type(o) {
    switch(o) {
      case null: return NULL_TYPE;
      case (void 0): return UNDEFINED_TYPE;
    }
    var type = typeof o;
    switch(type) {
      case 'boolean': return BOOLEAN_TYPE;
      case 'number':  return NUMBER_TYPE;
      case 'string':  return STRING_TYPE;
    }
    return OBJECT_TYPE;
  }
 
  function extend(destination, source) {
    for (var property in source)
      destination[property] = source[property];
    return destination;
  }
 
  function inspect(object) {
    try {
      if (isUndefined(object)) return 'undefined';
      if (object === null) return 'null';
      return object.inspect ? object.inspect() : String(object);
    } catch (e) {
      if (e instanceof RangeError) return '...';
      throw e;
    }
  }
 
  function toJSON(value) {
    return Str('', { '': value }, []);
  }
 
  function Str(key, holder, stack) {
    var value = holder[key];
    if (Type(value) === OBJECT_TYPE && typeof value.toJSON === 'function') {
      value = value.toJSON(key);
    }
 
    var _class = _toString.call(value);
 
    switch (_class) {
      case NUMBER_CLASS:
      case BOOLEAN_CLASS:
      case STRING_CLASS:
        value = value.valueOf();
    }
 
    switch (value) {
      case null: return 'null';
      case true: return 'true';
      case false: return 'false';
    }
 
    var type = typeof value;
    switch (type) {
      case 'string':
        return value.inspect(true);
      case 'number':
        return isFinite(value) ? String(value) : 'null';
      case 'object':
 
        for (var i = 0, length = stack.length; i < length; i++) {
          if (stack[i] === value) {
            throw new TypeError("Cyclic reference to '" + value + "' in object");
          }
        }
        stack.push(value);
 
        var partial = [];
        if (_class === ARRAY_CLASS) {
          for (var i = 0, length = value.length; i < length; i++) {
            var str = Str(i, value, stack);
            partial.push(typeof str === 'undefined' ? 'null' : str);
          }
          partial = '[' + partial.join(',') + ']';
        } else {
          var keys = Object.keys(value);
          for (var i = 0, length = keys.length; i < length; i++) {
            var key = keys[i], str = Str(key, value, stack);
            if (typeof str !== "undefined") {
               partial.push(key.inspect(true)+ ':' + str);
             }
          }
          partial = '{' + partial.join(',') + '}';
        }
        stack.pop();
        return partial;
    }
  }
 
  function stringify(object) {
    return JSON.stringify(object);
  }
 
  function toQueryString(object) {
    return $H(object).toQueryString();
  }
 
  function toHTML(object) {
    return object && object.toHTML ? object.toHTML() : String.interpret(object);
  }
 
  function keys(object) {
    if (Type(object) !== OBJECT_TYPE) { throw new TypeError(); }
    var results = [];
    for (var property in object) {
      if (_hasOwnProperty.call(object, property))
        results.push(property);
    }
 
    if (IS_DONTENUM_BUGGY) {
      for (var i = 0; property = DONT_ENUMS[i]; i++) {
        if (_hasOwnProperty.call(object, property))
          results.push(property);
      }
    }
 
    return results;
  }
 
  function values(object) {
    var results = [];
    for (var property in object)
      results.push(object[property]);
    return results;
  }
 
  function clone(object) {
    return extend({ }, object);
  }
 
  function isElement(object) {
    return !!(object && object.nodeType == 1);
  }
 
  function isArray(object) {
    return _toString.call(object) === ARRAY_CLASS;
  }
 
  var hasNativeIsArray = (typeof Array.isArray == 'function')
    && Array.isArray([]) && !Array.isArray({});
 
  if (hasNativeIsArray) {
    isArray = Array.isArray;
  }
 
  function isHash(object) {
    return object instanceof Hash;
  }
 
  function isFunction(object) {
    return _toString.call(object) === FUNCTION_CLASS;
  }
 
  function isString(object) {
    return _toString.call(object) === STRING_CLASS;
  }
 
  function isNumber(object) {
    return _toString.call(object) === NUMBER_CLASS;
  }
 
  function isDate(object) {
    return _toString.call(object) === DATE_CLASS;
  }
 
  function isUndefined(object) {
    return typeof object === "undefined";
  }
 
  extend(Object, {
    extend:        extend,
    inspect:       inspect,
    toJSON:        NATIVE_JSON_STRINGIFY_SUPPORT ? stringify : toJSON,
    toQueryString: toQueryString,
    toHTML:        toHTML,
    keys:          Object.keys || keys,
    values:        values,
    clone:         clone,
    isElement:     isElement,
    isArray:       isArray,
    isHash:        isHash,
    isFunction:    isFunction,
    isString:      isString,
    isNumber:      isNumber,
    isDate:        isDate,
    isUndefined:   isUndefined
  });
})();
Object.extend(Function.prototype, (function() {
  var slice = Array.prototype.slice;
 
  function update(array, args) {
    var arrayLength = array.length, length = args.length;
    while (length--) array[arrayLength + length] = args[length];
    return array;
  }
 
  function merge(array, args) {
    array = slice.call(array, 0);
    return update(array, args);
  }
 
  function argumentNames() {
    var names = this.toString().match(/^[\s\‍(]*function[^(]*\‍(([^)]*)\‍)/)[1]
      .replace(/\/\/.*?[\r\n]|\/\*(?:.|[\r\n])*?\*\//g, '')
      .replace(/\s+/g, '').split(',');
    return names.length == 1 && !names[0] ? [] : names;
  }
 
 
  function bind(context) {
    if (arguments.length < 2 && Object.isUndefined(arguments[0]))
      return this;
 
    if (!Object.isFunction(this))
      throw new TypeError("The object is not callable.");
 
    var nop = function() {};
    var __method = this, args = slice.call(arguments, 1);
 
    var bound = function() {
      var a = merge(args, arguments);
      var c = this instanceof bound ? this : context;
      return __method.apply(c, a);
    };
 
    nop.prototype   = this.prototype;
    bound.prototype = new nop();
 
    return bound;
  }
 
  function bindAsEventListener(context) {
    var __method = this, args = slice.call(arguments, 1);
    return function(event) {
      var a = update([event || window.event], args);
      return __method.apply(context, a);
    }
  }
 
  function curry() {
    if (!arguments.length) return this;
    var __method = this, args = slice.call(arguments, 0);
    return function() {
      var a = merge(args, arguments);
      return __method.apply(this, a);
    }
  }
 
  function delay(timeout) {
    var __method = this, args = slice.call(arguments, 1);
    timeout = timeout * 1000;
    return window.setTimeout(function() {
      return __method.apply(__method, args);
    }, timeout);
  }
 
  function defer() {
    var args = update([0.01], arguments);
    return this.delay.apply(this, args);
  }
 
  function wrap(wrapper) {
    var __method = this;
    return function() {
      var a = update([__method.bind(this)], arguments);
      return wrapper.apply(this, a);
    }
  }
 
  function methodize() {
    if (this._methodized) return this._methodized;
    var __method = this;
    return this._methodized = function() {
      var a = update([this], arguments);
      return __method.apply(null, a);
    };
  }
 
  var extensions = {
    argumentNames:       argumentNames,
    bindAsEventListener: bindAsEventListener,
    curry:               curry,
    delay:               delay,
    defer:               defer,
    wrap:                wrap,
    methodize:           methodize
  };
 
  if (!Function.prototype.bind)
    extensions.bind = bind;
 
  return extensions;
})());
 
 
 
(function(proto) {
 
 
  function toISOString() {
    return this.getUTCFullYear() + '-' +
      (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
      this.getUTCDate().toPaddedString(2) + 'T' +
      this.getUTCHours().toPaddedString(2) + ':' +
      this.getUTCMinutes().toPaddedString(2) + ':' +
      this.getUTCSeconds().toPaddedString(2) + 'Z';
  }
 
 
  function toJSON() {
    return this.toISOString();
  }
 
  if (!proto.toISOString) proto.toISOString = toISOString;
  if (!proto.toJSON) proto.toJSON = toJSON;
 
})(Date.prototype);
 
 
RegExp.prototype.match = RegExp.prototype.test;
 
RegExp.escape = function(str) {
  return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
};
var PeriodicalExecuter = Class.create({
  initialize: function(callback, frequency) {
    this.callback = callback;
    this.frequency = frequency;
    this.currentlyExecuting = false;
 
    this.registerCallback();
  },
 
  registerCallback: function() {
    this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
  },
 
  execute: function() {
    this.callback(this);
  },
 
  stop: function() {
    if (!this.timer) return;
    clearInterval(this.timer);
    this.timer = null;
  },
 
  onTimerEvent: function() {
    if (!this.currentlyExecuting) {
      try {
        this.currentlyExecuting = true;
        this.execute();
        this.currentlyExecuting = false;
      } catch(e) {
        this.currentlyExecuting = false;
        throw e;
      }
    }
  }
});
Object.extend(String, {
  interpret: function(value) {
    return value == null ? '' : String(value);
  },
  specialChar: {
    '\b': '\\b',
    '\t': '\\t',
    '\n': '\\n',
    '\f': '\\f',
    '\r': '\\r',
    '\\': '\\\\'
  }
});
 
Object.extend(String.prototype, (function() {
  var NATIVE_JSON_PARSE_SUPPORT = window.JSON &&
    typeof JSON.parse === 'function' &&
    JSON.parse('{"test": true}').test;
 
  function prepareReplacement(replacement) {
    if (Object.isFunction(replacement)) return replacement;
    var template = new Template(replacement);
    return function(match) { return template.evaluate(match) };
  }
 
  function isNonEmptyRegExp(regexp) {
    return regexp.source && regexp.source !== '(?:)';
  }
 
 
  function gsub(pattern, replacement) {
    var result = '', source = this, match;
    replacement = prepareReplacement(replacement);
 
    if (Object.isString(pattern))
      pattern = RegExp.escape(pattern);
 
    if (!(pattern.length || isNonEmptyRegExp(pattern))) {
      replacement = replacement('');
      return replacement + source.split('').join(replacement) + replacement;
    }
 
    while (source.length > 0) {
      match = source.match(pattern)
      if (match && match[0].length > 0) {
        result += source.slice(0, match.index);
        result += String.interpret(replacement(match));
        source  = source.slice(match.index + match[0].length);
      } else {
        result += source, source = '';
      }
    }
    return result;
  }
 
  function sub(pattern, replacement, count) {
    replacement = prepareReplacement(replacement);
    count = Object.isUndefined(count) ? 1 : count;
 
    return this.gsub(pattern, function(match) {
      if (--count < 0) return match[0];
      return replacement(match);
    });
  }
 
  function scan(pattern, iterator) {
    this.gsub(pattern, iterator);
    return String(this);
  }
 
  function truncate(length, truncation) {
    length = length || 30;
    truncation = Object.isUndefined(truncation) ? '...' : truncation;
    return this.length > length ?
      this.slice(0, length - truncation.length) + truncation : String(this);
  }
 
  function strip() {
    return this.replace(/^\s+/, '').replace(/\s+$/, '');
  }
 
  function stripTags() {
    return this.replace(/<\w+(\s+("[^"]*"|'[^']*'|[^>])+)?>|<\/\w+>/gi, '');
  }
 
  function stripScripts() {
    return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
  }
 
  function extractScripts() {
    var matchAll = new RegExp(Prototype.ScriptFragment, 'img'),
        matchOne = new RegExp(Prototype.ScriptFragment, 'im');
    return (this.match(matchAll) || []).map(function(scriptTag) {
      return (scriptTag.match(matchOne) || ['', ''])[1];
    });
  }
 
  function evalScripts() {
    return this.extractScripts().map(function(script) { return eval(script); });
  }
 
  function escapeHTML() {
    return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
  }
 
  function unescapeHTML() {
    return this.stripTags().replace(/&lt;/g,'<').replace(/&gt;/g,'>').replace(/&amp;/g,'&');
  }
 
 
  function toQueryParams(separator) {
    var match = this.strip().match(/([^?#]*)(#.*)?$/);
    if (!match) return { };
 
    return match[1].split(separator || '&').inject({ }, function(hash, pair) {
      if ((pair = pair.split('='))[0]) {
        var key = decodeURIComponent(pair.shift()),
            value = pair.length > 1 ? pair.join('=') : pair[0];
 
        if (value != undefined) {
          value = value.gsub('+', ' ');
          value = decodeURIComponent(value);
        }
 
        if (key in hash) {
          if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
          hash[key].push(value);
        }
        else hash[key] = value;
      }
      return hash;
    });
  }
 
  function toArray() {
    return this.split('');
  }
 
  function succ() {
    return this.slice(0, this.length - 1) +
      String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
  }
 
  function times(count) {
    return count < 1 ? '' : new Array(count + 1).join(this);
  }
 
  function camelize() {
    return this.replace(/-+(.)?/g, function(match, chr) {
      return chr ? chr.toUpperCase() : '';
    });
  }
 
  function capitalize() {
    return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
  }
 
  function underscore() {
    return this.replace(/::/g, '/')
               .replace(/([A-Z]+)([A-Z][a-z])/g, '$1_$2')
               .replace(/([a-z\d])([A-Z])/g, '$1_$2')
               .replace(/-/g, '_')
               .toLowerCase();
  }
 
  function dasherize() {
    return this.replace(/_/g, '-');
  }
 
  function inspect(useDoubleQuotes) {
    var escapedString = this.replace(/[\x00-\x1f\\]/g, function(character) {
      if (character in String.specialChar) {
        return String.specialChar[character];
      }
      return '\\u00' + character.charCodeAt().toPaddedString(2, 16);
    });
    if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
    return "'" + escapedString.replace(/'/g, '\\\'') + "'";
  }
 
  function unfilterJSON(filter) {
    return this.replace(filter || Prototype.JSONFilter, '$1');
  }
 
  function isJSON() {
    var str = this;
    if (str.blank()) return false;
    str = str.replace(/\\‍(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@');
    str = str.replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']');
    str = str.replace(/(?:^|:|,)(?:\s*\[)+/g, '');
    return (/^[\],:{}\s]*$/).test(str);
  }
 
  function evalJSON(sanitize) {
    var json = this.unfilterJSON(),
        cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
    if (cx.test(json)) {
      json = json.replace(cx, function (a) {
        return '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
      });
    }
    try {
      if (!sanitize || json.isJSON()) return eval('(' + json + ')');
    } catch (e) { }
    throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
  }
 
  function parseJSON() {
    var json = this.unfilterJSON();
    return JSON.parse(json);
  }
 
  function include(pattern) {
    return this.indexOf(pattern) > -1;
  }
 
  function startsWith(pattern, position) {
    position = Object.isNumber(position) ? position : 0;
    return this.lastIndexOf(pattern, position) === position;
  }
 
  function endsWith(pattern, position) {
    pattern = String(pattern);
    position = Object.isNumber(position) ? position : this.length;
    if (position < 0) position = 0;
    if (position > this.length) position = this.length;
    var d = position - pattern.length;
    return d >= 0 && this.indexOf(pattern, d) === d;
  }
 
  function empty() {
    return this == '';
  }
 
  function blank() {
    return /^\s*$/.test(this);
  }
 
  function interpolate(object, pattern) {
    return new Template(this, pattern).evaluate(object);
  }
 
  return {
    gsub:           gsub,
    sub:            sub,
    scan:           scan,
    truncate:       truncate,
    strip:          String.prototype.trim || strip,
    stripTags:      stripTags,
    stripScripts:   stripScripts,
    extractScripts: extractScripts,
    evalScripts:    evalScripts,
    escapeHTML:     escapeHTML,
    unescapeHTML:   unescapeHTML,
    toQueryParams:  toQueryParams,
    parseQuery:     toQueryParams,
    toArray:        toArray,
    succ:           succ,
    times:          times,
    camelize:       camelize,
    capitalize:     capitalize,
    underscore:     underscore,
    dasherize:      dasherize,
    inspect:        inspect,
    unfilterJSON:   unfilterJSON,
    isJSON:         isJSON,
    evalJSON:       NATIVE_JSON_PARSE_SUPPORT ? parseJSON : evalJSON,
    include:        include,
    startsWith:     String.prototype.startsWith || startsWith,
    endsWith:       String.prototype.endsWith || endsWith,
    empty:          empty,
    blank:          blank,
    interpolate:    interpolate
  };
})());
 
var Template = Class.create({
  initialize: function(template, pattern) {
    this.template = template.toString();
    this.pattern = pattern || Template.Pattern;
  },
 
  evaluate: function(object) {
    if (object && Object.isFunction(object.toTemplateReplacements))
      object = object.toTemplateReplacements();
 
    return this.template.gsub(this.pattern, function(match) {
      if (object == null) return (match[1] + '');
 
      var before = match[1] || '';
      if (before == '\\') return match[2];
 
      var ctx = object, expr = match[3],
          pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
 
      match = pattern.exec(expr);
      if (match == null) return before;
 
      while (match != null) {
        var comp = match[1].startsWith('[') ? match[2].replace(/\\\\]/g, ']') : match[1];
        ctx = ctx[comp];
        if (null == ctx || '' == match[3]) break;
        expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
        match = pattern.exec(expr);
      }
 
      return before + String.interpret(ctx);
    });
  }
});
Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
 
var $break = { };
 
var Enumerable = (function() {
  function each(iterator, context) {
    try {
      this._each(iterator, context);
    } catch (e) {
      if (e != $break) throw e;
    }
    return this;
  }
 
  function eachSlice(number, iterator, context) {
    var index = -number, slices = [], array = this.toArray();
    if (number < 1) return array;
    while ((index += number) < array.length)
      slices.push(array.slice(index, index+number));
    return slices.collect(iterator, context);
  }
 
  function all(iterator, context) {
    iterator = iterator || Prototype.K;
    var result = true;
    this.each(function(value, index) {
      result = result && !!iterator.call(context, value, index, this);
      if (!result) throw $break;
    }, this);
    return result;
  }
 
  function any(iterator, context) {
    iterator = iterator || Prototype.K;
    var result = false;
    this.each(function(value, index) {
      if (result = !!iterator.call(context, value, index, this))
        throw $break;
    }, this);
    return result;
  }
 
  function collect(iterator, context) {
    iterator = iterator || Prototype.K;
    var results = [];
    this.each(function(value, index) {
      results.push(iterator.call(context, value, index, this));
    }, this);
    return results;
  }
 
  function detect(iterator, context) {
    var result;
    this.each(function(value, index) {
      if (iterator.call(context, value, index, this)) {
        result = value;
        throw $break;
      }
    }, this);
    return result;
  }
 
  function findAll(iterator, context) {
    var results = [];
    this.each(function(value, index) {
      if (iterator.call(context, value, index, this))
        results.push(value);
    }, this);
    return results;
  }
 
  function grep(filter, iterator, context) {
    iterator = iterator || Prototype.K;
    var results = [];
 
    if (Object.isString(filter))
      filter = new RegExp(RegExp.escape(filter));
 
    this.each(function(value, index) {
      if (filter.match(value))
        results.push(iterator.call(context, value, index, this));
    }, this);
    return results;
  }
 
  function include(object) {
    if (Object.isFunction(this.indexOf) && this.indexOf(object) != -1)
      return true;
 
    var found = false;
    this.each(function(value) {
      if (value == object) {
        found = true;
        throw $break;
      }
    });
    return found;
  }
 
  function inGroupsOf(number, fillWith) {
    fillWith = Object.isUndefined(fillWith) ? null : fillWith;
    return this.eachSlice(number, function(slice) {
      while(slice.length < number) slice.push(fillWith);
      return slice;
    });
  }
 
  function inject(memo, iterator, context) {
    this.each(function(value, index) {
      memo = iterator.call(context, memo, value, index, this);
    }, this);
    return memo;
  }
 
  function invoke(method) {
    var args = $A(arguments).slice(1);
    return this.map(function(value) {
      return value[method].apply(value, args);
    });
  }
 
  function max(iterator, context) {
    iterator = iterator || Prototype.K;
    var result;
    this.each(function(value, index) {
      value = iterator.call(context, value, index, this);
      if (result == null || value >= result)
        result = value;
    }, this);
    return result;
  }
 
  function min(iterator, context) {
    iterator = iterator || Prototype.K;
    var result;
    this.each(function(value, index) {
      value = iterator.call(context, value, index, this);
      if (result == null || value < result)
        result = value;
    }, this);
    return result;
  }
 
  function partition(iterator, context) {
    iterator = iterator || Prototype.K;
    var trues = [], falses = [];
    this.each(function(value, index) {
      (iterator.call(context, value, index, this) ?
        trues : falses).push(value);
    }, this);
    return [trues, falses];
  }
 
  function pluck(property) {
    var results = [];
    this.each(function(value) {
      results.push(value[property]);
    });
    return results;
  }
 
  function reject(iterator, context) {
    var results = [];
    this.each(function(value, index) {
      if (!iterator.call(context, value, index, this))
        results.push(value);
    }, this);
    return results;
  }
 
  function sortBy(iterator, context) {
    return this.map(function(value, index) {
      return {
        value: value,
        criteria: iterator.call(context, value, index, this)
      };
    }, this).sort(function(left, right) {
      var a = left.criteria, b = right.criteria;
      return a < b ? -1 : a > b ? 1 : 0;
    }).pluck('value');
  }
 
  function toArray() {
    return this.map();
  }
 
  function zip() {
    var iterator = Prototype.K, args = $A(arguments);
    if (Object.isFunction(args.last()))
      iterator = args.pop();
 
    var collections = [this].concat(args).map($A);
    return this.map(function(value, index) {
      return iterator(collections.pluck(index));
    });
  }
 
  function size() {
    return this.toArray().length;
  }
 
  function inspect() {
    return '#<Enumerable:' + this.toArray().inspect() + '>';
  }
 
 
 
 
 
 
 
 
 
  return {
    each:       each,
    eachSlice:  eachSlice,
    all:        all,
    every:      all,
    any:        any,
    some:       any,
    collect:    collect,
    map:        collect,
    detect:     detect,
    findAll:    findAll,
    select:     findAll,
    filter:     findAll,
    grep:       grep,
    include:    include,
    member:     include,
    inGroupsOf: inGroupsOf,
    inject:     inject,
    invoke:     invoke,
    max:        max,
    min:        min,
    partition:  partition,
    pluck:      pluck,
    reject:     reject,
    sortBy:     sortBy,
    toArray:    toArray,
    entries:    toArray,
    zip:        zip,
    size:       size,
    inspect:    inspect,
    find:       detect
  };
})();
 
function $A(iterable) {
  if (!iterable) return [];
  if ('toArray' in Object(iterable)) return iterable.toArray();
  var length = iterable.length || 0, results = new Array(length);
  while (length--) results[length] = iterable[length];
  return results;
}
 
 
function $w(string) {
  if (!Object.isString(string)) return [];
  string = string.strip();
  return string ? string.split(/\s+/) : [];
}
 
Array.from = $A;
 
 
(function() {
  var arrayProto = Array.prototype,
      slice = arrayProto.slice,
      _each = arrayProto.forEach; // use native browser JS 1.6 implementation if available
 
  function each(iterator, context) {
    for (var i = 0, length = this.length >>> 0; i < length; i++) {
      if (i in this) iterator.call(context, this[i], i, this);
    }
  }
  if (!_each) _each = each;
 
  function clear() {
    this.length = 0;
    return this;
  }
 
  function first() {
    return this[0];
  }
 
  function last() {
    return this[this.length - 1];
  }
 
  function compact() {
    return this.select(function(value) {
      return value != null;
    });
  }
 
  function flatten() {
    return this.inject([], function(array, value) {
      if (Object.isArray(value))
        return array.concat(value.flatten());
      array.push(value);
      return array;
    });
  }
 
  function without() {
    var values = slice.call(arguments, 0);
    return this.select(function(value) {
      return !values.include(value);
    });
  }
 
  function reverse(inline) {
    return (inline === false ? this.toArray() : this)._reverse();
  }
 
  function uniq(sorted) {
    return this.inject([], function(array, value, index) {
      if (0 == index || (sorted ? array.last() != value : !array.include(value)))
        array.push(value);
      return array;
    });
  }
 
  function intersect(array) {
    return this.uniq().findAll(function(item) {
      return array.indexOf(item) !== -1;
    });
  }
 
 
  function clone() {
    return slice.call(this, 0);
  }
 
  function size() {
    return this.length;
  }
 
  function inspect() {
    return '[' + this.map(Object.inspect).join(', ') + ']';
  }
 
  function indexOf(item, i) {
    if (this == null) throw new TypeError();
 
    var array = Object(this), length = array.length >>> 0;
    if (length === 0) return -1;
 
    i = Number(i);
    if (isNaN(i)) {
      i = 0;
    } else if (i !== 0 && isFinite(i)) {
      i = (i > 0 ? 1 : -1) * Math.floor(Math.abs(i));
    }
 
    if (i > length) return -1;
 
    var k = i >= 0 ? i : Math.max(length - Math.abs(i), 0);
    for (; k < length; k++)
      if (k in array && array[k] === item) return k;
    return -1;
  }
 
 
  function lastIndexOf(item, i) {
    if (this == null) throw new TypeError();
 
    var array = Object(this), length = array.length >>> 0;
    if (length === 0) return -1;
 
    if (!Object.isUndefined(i)) {
      i = Number(i);
      if (isNaN(i)) {
        i = 0;
      } else if (i !== 0 && isFinite(i)) {
        i = (i > 0 ? 1 : -1) * Math.floor(Math.abs(i));
      }
    } else {
      i = length;
    }
 
    var k = i >= 0 ? Math.min(i, length - 1) :
     length - Math.abs(i);
 
    for (; k >= 0; k--)
      if (k in array && array[k] === item) return k;
    return -1;
  }
 
  function concat(_) {
    var array = [], items = slice.call(arguments, 0), item, n = 0;
    items.unshift(this);
    for (var i = 0, length = items.length; i < length; i++) {
      item = items[i];
      if (Object.isArray(item) && !('callee' in item)) {
        for (var j = 0, arrayLength = item.length; j < arrayLength; j++) {
          if (j in item) array[n] = item[j];
          n++;
        }
      } else {
        array[n++] = item;
      }
    }
    array.length = n;
    return array;
  }
 
 
  function wrapNative(method) {
    return function() {
      if (arguments.length === 0) {
        return method.call(this, Prototype.K);
      } else if (arguments[0] === undefined) {
        var args = slice.call(arguments, 1);
        args.unshift(Prototype.K);
        return method.apply(this, args);
      } else {
        return method.apply(this, arguments);
      }
    };
  }
 
 
  function map(iterator) {
    if (this == null) throw new TypeError();
    iterator = iterator || Prototype.K;
 
    var object = Object(this);
    var results = [], context = arguments[1], n = 0;
 
    for (var i = 0, length = object.length >>> 0; i < length; i++) {
      if (i in object) {
        results[n] = iterator.call(context, object[i], i, object);
      }
      n++;
    }
    results.length = n;
    return results;
  }
 
  if (arrayProto.map) {
    map = wrapNative(Array.prototype.map);
  }
 
  function filter(iterator) {
    if (this == null || !Object.isFunction(iterator))
      throw new TypeError();
 
    var object = Object(this);
    var results = [], context = arguments[1], value;
 
    for (var i = 0, length = object.length >>> 0; i < length; i++) {
      if (i in object) {
        value = object[i];
        if (iterator.call(context, value, i, object)) {
          results.push(value);
        }
      }
    }
    return results;
  }
 
  if (arrayProto.filter) {
    filter = Array.prototype.filter;
  }
 
  function some(iterator) {
    if (this == null) throw new TypeError();
    iterator = iterator || Prototype.K;
    var context = arguments[1];
 
    var object = Object(this);
    for (var i = 0, length = object.length >>> 0; i < length; i++) {
      if (i in object && iterator.call(context, object[i], i, object)) {
        return true;
      }
    }
 
    return false;
  }
 
  if (arrayProto.some) {
    var some = wrapNative(Array.prototype.some);
  }
 
 
  function every(iterator) {
    if (this == null) throw new TypeError();
    iterator = iterator || Prototype.K;
    var context = arguments[1];
 
    var object = Object(this);
    for (var i = 0, length = object.length >>> 0; i < length; i++) {
      if (i in object && !iterator.call(context, object[i], i, object)) {
        return false;
      }
    }
 
    return true;
  }
 
  if (arrayProto.every) {
    var every = wrapNative(Array.prototype.every);
  }
 
  var _reduce = arrayProto.reduce;
  function inject(memo, iterator) {
    iterator = iterator || Prototype.K;
    var context = arguments[2];
    return _reduce.call(this, iterator.bind(context), memo);
  }
 
  if (!arrayProto.reduce) {
    var inject = Enumerable.inject;
  }
 
  Object.extend(arrayProto, Enumerable);
 
  if (!arrayProto._reverse)
    arrayProto._reverse = arrayProto.reverse;
 
  Object.extend(arrayProto, {
    _each:     _each,
 
    map:       map,
    collect:   map,
    select:    filter,
    filter:    filter,
    findAll:   filter,
    some:      some,
    any:       some,
    every:     every,
    all:       every,
    inject:    inject,
 
    clear:     clear,
    first:     first,
    last:      last,
    compact:   compact,
    flatten:   flatten,
    without:   without,
    reverse:   reverse,
    uniq:      uniq,
    intersect: intersect,
    clone:     clone,
    toArray:   clone,
    size:      size,
    inspect:   inspect
  });
 
  var CONCAT_ARGUMENTS_BUGGY = (function() {
    return [].concat(arguments)[0][0] !== 1;
  })(1,2);
 
  if (CONCAT_ARGUMENTS_BUGGY) arrayProto.concat = concat;
 
  if (!arrayProto.indexOf) arrayProto.indexOf = indexOf;
  if (!arrayProto.lastIndexOf) arrayProto.lastIndexOf = lastIndexOf;
})();
function $H(object) {
  return new Hash(object);
};
 
var Hash = Class.create(Enumerable, (function() {
  function initialize(object) {
    this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
  }
 
 
  function _each(iterator, context) {
    var i = 0;
    for (var key in this._object) {
      var value = this._object[key], pair = [key, value];
      pair.key = key;
      pair.value = value;
      iterator.call(context, pair, i);
      i++;
    }
  }
 
  function set(key, value) {
    return this._object[key] = value;
  }
 
  function get(key) {
    if (this._object[key] !== Object.prototype[key])
      return this._object[key];
  }
 
  function unset(key) {
    var value = this._object[key];
    delete this._object[key];
    return value;
  }
 
  function toObject() {
    return Object.clone(this._object);
  }
 
 
 
  function keys() {
    return this.pluck('key');
  }
 
  function values() {
    return this.pluck('value');
  }
 
  function index(value) {
    var match = this.detect(function(pair) {
      return pair.value === value;
    });
    return match && match.key;
  }
 
  function merge(object) {
    return this.clone().update(object);
  }
 
  function update(object) {
    return new Hash(object).inject(this, function(result, pair) {
      result.set(pair.key, pair.value);
      return result;
    });
  }
 
  function toQueryPair(key, value) {
    if (Object.isUndefined(value)) return key;
 
    value = String.interpret(value);
 
    value = value.gsub(/(\r)?\n/, '\r\n');
    value = encodeURIComponent(value);
    value = value.gsub(/%20/, '+');
    return key + '=' + value;
  }
 
  function toQueryString() {
    return this.inject([], function(results, pair) {
      var key = encodeURIComponent(pair.key), values = pair.value;
 
      if (values && typeof values == 'object') {
        if (Object.isArray(values)) {
          var queryValues = [];
          for (var i = 0, len = values.length, value; i < len; i++) {
            value = values[i];
            queryValues.push(toQueryPair(key, value));
          }
          return results.concat(queryValues);
        }
      } else results.push(toQueryPair(key, values));
      return results;
    }).join('&');
  }
 
  function inspect() {
    return '#<Hash:{' + this.map(function(pair) {
      return pair.map(Object.inspect).join(': ');
    }).join(', ') + '}>';
  }
 
  function clone() {
    return new Hash(this);
  }
 
  return {
    initialize:             initialize,
    _each:                  _each,
    set:                    set,
    get:                    get,
    unset:                  unset,
    toObject:               toObject,
    toTemplateReplacements: toObject,
    keys:                   keys,
    values:                 values,
    index:                  index,
    merge:                  merge,
    update:                 update,
    toQueryString:          toQueryString,
    inspect:                inspect,
    toJSON:                 toObject,
    clone:                  clone
  };
})());
 
Hash.from = $H;
Object.extend(Number.prototype, (function() {
  function toColorPart() {
    return this.toPaddedString(2, 16);
  }
 
  function succ() {
    return this + 1;
  }
 
  function times(iterator, context) {
    $R(0, this, true).each(iterator, context);
    return this;
  }
 
  function toPaddedString(length, radix) {
    var string = this.toString(radix || 10);
    return '0'.times(length - string.length) + string;
  }
 
  function abs() {
    return Math.abs(this);
  }
 
  function round() {
    return Math.round(this);
  }
 
  function ceil() {
    return Math.ceil(this);
  }
 
  function floor() {
    return Math.floor(this);
  }
 
  return {
    toColorPart:    toColorPart,
    succ:           succ,
    times:          times,
    toPaddedString: toPaddedString,
    abs:            abs,
    round:          round,
    ceil:           ceil,
    floor:          floor
  };
})());
 
function $R(start, end, exclusive) {
  return new ObjectRange(start, end, exclusive);
}
 
var ObjectRange = Class.create(Enumerable, (function() {
  function initialize(start, end, exclusive) {
    this.start = start;
    this.end = end;
    this.exclusive = exclusive;
  }
 
  function _each(iterator, context) {
    var value = this.start, i;
    for (i = 0; this.include(value); i++) {
      iterator.call(context, value, i);
      value = value.succ();
    }
  }
 
  function include(value) {
    if (value < this.start)
      return false;
    if (this.exclusive)
      return value < this.end;
    return value <= this.end;
  }
 
  return {
    initialize: initialize,
    _each:      _each,
    include:    include
  };
})());
 
 
 
var Abstract = { };
 
 
var Try = {
  these: function() {
    var returnValue;
 
    for (var i = 0, length = arguments.length; i < length; i++) {
      var lambda = arguments[i];
      try {
        returnValue = lambda();
        break;
      } catch (e) { }
    }
 
    return returnValue;
  }
};
 
var Ajax = {
  getTransport: function() {
    return Try.these(
      function() {return new XMLHttpRequest()},
      function() {return new ActiveXObject('Msxml2.XMLHTTP')},
      function() {return new ActiveXObject('Microsoft.XMLHTTP')}
    ) || false;
  },
 
  activeRequestCount: 0
};
 
Ajax.Responders = {
  responders: [],
 
  _each: function(iterator, context) {
    this.responders._each(iterator, context);
  },
 
  register: function(responder) {
    if (!this.include(responder))
      this.responders.push(responder);
  },
 
  unregister: function(responder) {
    this.responders = this.responders.without(responder);
  },
 
  dispatch: function(callback, request, transport, json) {
    this.each(function(responder) {
      if (Object.isFunction(responder[callback])) {
        try {
          responder[callback].apply(responder, [request, transport, json]);
        } catch (e) { }
      }
    });
  }
};
 
Object.extend(Ajax.Responders, Enumerable);
 
Ajax.Responders.register({
  onCreate:   function() { Ajax.activeRequestCount++ },
  onComplete: function() { Ajax.activeRequestCount-- }
});
Ajax.Base = Class.create({
  initialize: function(options) {
    this.options = {
      method:       'post',
      asynchronous: true,
      contentType:  'application/x-www-form-urlencoded',
      encoding:     'UTF-8',
      parameters:   '',
      evalJSON:     true,
      evalJS:       true
    };
    Object.extend(this.options, options || { });
 
    this.options.method = this.options.method.toLowerCase();
 
    if (Object.isHash(this.options.parameters))
      this.options.parameters = this.options.parameters.toObject();
  }
});
Ajax.Request = Class.create(Ajax.Base, {
  _complete: false,
 
  initialize: function($super, url, options) {
    $super(options);
    this.transport = Ajax.getTransport();
    this.request(url);
  },
 
  request: function(url) {
    this.url = url;
    this.method = this.options.method;
    var params = Object.isString(this.options.parameters) ?
          this.options.parameters :
          Object.toQueryString(this.options.parameters);
 
    if (!['get', 'post'].include(this.method)) {
      params += (params ? '&' : '') + "_method=" + this.method;
      this.method = 'post';
    }
 
    if (params && this.method === 'get') {
      this.url += (this.url.include('?') ? '&' : '?') + params;
    }
 
    this.parameters = params.toQueryParams();
 
    try {
      var response = new Ajax.Response(this);
      if (this.options.onCreate) this.options.onCreate(response);
      Ajax.Responders.dispatch('onCreate', this, response);
 
      this.transport.open(this.method.toUpperCase(), this.url,
        this.options.asynchronous);
 
      if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);
 
      this.transport.onreadystatechange = this.onStateChange.bind(this);
      this.setRequestHeaders();
 
      this.body = this.method == 'post' ? (this.options.postBody || params) : null;
      this.transport.send(this.body);
 
      /* Force Firefox to handle ready state 4 for synchronous requests */
      if (!this.options.asynchronous && this.transport.overrideMimeType)
        this.onStateChange();
 
    }
    catch (e) {
      this.dispatchException(e);
    }
  },
 
  onStateChange: function() {
    var readyState = this.transport.readyState;
    if (readyState > 1 && !((readyState == 4) && this._complete))
      this.respondToReadyState(this.transport.readyState);
  },
 
  setRequestHeaders: function() {
    var headers = {
      'X-Requested-With': 'XMLHttpRequest',
      'X-Prototype-Version': Prototype.Version,
      'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
    };
 
    if (this.method == 'post') {
      headers['Content-type'] = this.options.contentType +
        (this.options.encoding ? '; charset=' + this.options.encoding : '');
 
      /* Force "Connection: close" for older Mozilla browsers to work
       * around a bug where XMLHttpRequest sends an incorrect
       * Content-length header. See Mozilla Bugzilla #246651.
       */
      if (this.transport.overrideMimeType &&
          (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
            headers['Connection'] = 'close';
    }
 
    if (typeof this.options.requestHeaders == 'object') {
      var extras = this.options.requestHeaders;
 
      if (Object.isFunction(extras.push))
        for (var i = 0, length = extras.length; i < length; i += 2)
          headers[extras[i]] = extras[i+1];
      else
        $H(extras).each(function(pair) { headers[pair.key] = pair.value });
    }
 
    for (var name in headers)
      if (headers[name] != null)
        this.transport.setRequestHeader(name, headers[name]);
  },
 
  success: function() {
    var status = this.getStatus();
    return !status || (status >= 200 && status < 300) || status == 304;
  },
 
  getStatus: function() {
    try {
      if (this.transport.status === 1223) return 204;
      return this.transport.status || 0;
    } catch (e) { return 0 }
  },
 
  respondToReadyState: function(readyState) {
    var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);
 
    if (state == 'Complete') {
      try {
        this._complete = true;
        (this.options['on' + response.status]
         || this.options['on' + (this.success() ? 'Success' : 'Failure')]
         || Prototype.emptyFunction)(response, response.headerJSON);
      } catch (e) {
        this.dispatchException(e);
      }
 
      var contentType = response.getHeader('Content-type');
      if (this.options.evalJS == 'force'
          || (this.options.evalJS && this.isSameOrigin() && contentType
          && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
        this.evalResponse();
    }
 
    try {
      (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
      Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
    } catch (e) {
      this.dispatchException(e);
    }
 
    if (state == 'Complete') {
      this.transport.onreadystatechange = Prototype.emptyFunction;
    }
  },
 
  isSameOrigin: function() {
    var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
    return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
      protocol: location.protocol,
      domain: document.domain,
      port: location.port ? ':' + location.port : ''
    }));
  },
 
  getHeader: function(name) {
    try {
      return this.transport.getResponseHeader(name) || null;
    } catch (e) { return null; }
  },
 
  evalResponse: function() {
    try {
      return eval((this.transport.responseText || '').unfilterJSON());
    } catch (e) {
      this.dispatchException(e);
    }
  },
 
  dispatchException: function(exception) {
    (this.options.onException || Prototype.emptyFunction)(this, exception);
    Ajax.Responders.dispatch('onException', this, exception);
  }
});
 
Ajax.Request.Events =
  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
 
 
 
 
 
 
 
 
Ajax.Response = Class.create({
  initialize: function(request){
    this.request = request;
    var transport  = this.transport  = request.transport,
        readyState = this.readyState = transport.readyState;
 
    if ((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
      this.status       = this.getStatus();
      this.statusText   = this.getStatusText();
      this.responseText = String.interpret(transport.responseText);
      this.headerJSON   = this._getHeaderJSON();
    }
 
    if (readyState == 4) {
      var xml = transport.responseXML;
      this.responseXML  = Object.isUndefined(xml) ? null : xml;
      this.responseJSON = this._getResponseJSON();
    }
  },
 
  status:      0,
 
  statusText: '',
 
  getStatus: Ajax.Request.prototype.getStatus,
 
  getStatusText: function() {
    try {
      return this.transport.statusText || '';
    } catch (e) { return '' }
  },
 
  getHeader: Ajax.Request.prototype.getHeader,
 
  getAllHeaders: function() {
    try {
      return this.getAllResponseHeaders();
    } catch (e) { return null }
  },
 
  getResponseHeader: function(name) {
    return this.transport.getResponseHeader(name);
  },
 
  getAllResponseHeaders: function() {
    return this.transport.getAllResponseHeaders();
  },
 
  _getHeaderJSON: function() {
    var json = this.getHeader('X-JSON');
    if (!json) return null;
 
    try {
      json = decodeURIComponent(escape(json));
    } catch(e) {
    }
 
    try {
      return json.evalJSON(this.request.options.sanitizeJSON ||
        !this.request.isSameOrigin());
    } catch (e) {
      this.request.dispatchException(e);
    }
  },
 
  _getResponseJSON: function() {
    var options = this.request.options;
    if (!options.evalJSON || (options.evalJSON != 'force' &&
      !(this.getHeader('Content-type') || '').include('application/json')) ||
        this.responseText.blank())
          return null;
    try {
      return this.responseText.evalJSON(options.sanitizeJSON ||
        !this.request.isSameOrigin());
    } catch (e) {
      this.request.dispatchException(e);
    }
  }
});
 
Ajax.Updater = Class.create(Ajax.Request, {
  initialize: function($super, container, url, options) {
    this.container = {
      success: (container.success || container),
      failure: (container.failure || (container.success ? null : container))
    };
 
    options = Object.clone(options);
    var onComplete = options.onComplete;
    options.onComplete = (function(response, json) {
      this.updateContent(response.responseText);
      if (Object.isFunction(onComplete)) onComplete(response, json);
    }).bind(this);
 
    $super(url, options);
  },
 
  updateContent: function(responseText) {
    var receiver = this.container[this.success() ? 'success' : 'failure'],
        options = this.options;
 
    if (!options.evalScripts) responseText = responseText.stripScripts();
 
    if (receiver = $(receiver)) {
      if (options.insertion) {
        if (Object.isString(options.insertion)) {
          var insertion = { }; insertion[options.insertion] = responseText;
          receiver.insert(insertion);
        }
        else options.insertion(receiver, responseText);
      }
      else receiver.update(responseText);
    }
  }
});
 
Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
  initialize: function($super, container, url, options) {
    $super(options);
    this.onComplete = this.options.onComplete;
 
    this.frequency = (this.options.frequency || 2);
    this.decay = (this.options.decay || 1);
 
    this.updater = { };
    this.container = container;
    this.url = url;
 
    this.start();
  },
 
  start: function() {
    this.options.onComplete = this.updateComplete.bind(this);
    this.onTimerEvent();
  },
 
  stop: function() {
    this.updater.options.onComplete = undefined;
    clearTimeout(this.timer);
    (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
  },
 
  updateComplete: function(response) {
    if (this.options.decay) {
      this.decay = (response.responseText == this.lastText ?
        this.decay * this.options.decay : 1);
 
      this.lastText = response.responseText;
    }
    this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
  },
 
  onTimerEvent: function() {
    this.updater = new Ajax.Updater(this.container, this.url, this.options);
  }
});
 
(function(GLOBAL) {
 
  var UNDEFINED;
  var SLICE = Array.prototype.slice;
 
  var DIV = document.createElement('div');
 
 
  function $(element) {
    if (arguments.length > 1) {
      for (var i = 0, elements = [], length = arguments.length; i < length; i++)
        elements.push($(arguments[i]));
      return elements;
    }
 
    if (Object.isString(element))
      element = document.getElementById(element);
    return Element.extend(element);
  }
 
  GLOBAL.$ = $;
 
 
  if (!GLOBAL.Node) GLOBAL.Node = {};
 
  if (!GLOBAL.Node.ELEMENT_NODE) {
    Object.extend(GLOBAL.Node, {
      ELEMENT_NODE:                1,
      ATTRIBUTE_NODE:              2,
      TEXT_NODE:                   3,
      CDATA_SECTION_NODE:          4,
      ENTITY_REFERENCE_NODE:       5,
      ENTITY_NODE:                 6,
      PROCESSING_INSTRUCTION_NODE: 7,
      COMMENT_NODE:                8,
      DOCUMENT_NODE:               9,
      DOCUMENT_TYPE_NODE:         10,
      DOCUMENT_FRAGMENT_NODE:     11,
      NOTATION_NODE:              12
    });
  }
 
  var ELEMENT_CACHE = {};
 
  function shouldUseCreationCache(tagName, attributes) {
    if (tagName === 'select') return false;
    if ('type' in attributes) return false;
    return true;
  }
 
  var HAS_EXTENDED_CREATE_ELEMENT_SYNTAX = (function(){
    try {
      var el = document.createElement('<input name="x">');
      return el.tagName.toLowerCase() === 'input' && el.name === 'x';
    }
    catch(err) {
      return false;
    }
  })();
 
 
  var oldElement = GLOBAL.Element;
  function Element(tagName, attributes) {
    attributes = attributes || {};
    tagName = tagName.toLowerCase();
 
    if (HAS_EXTENDED_CREATE_ELEMENT_SYNTAX && attributes.name) {
      tagName = '<' + tagName + ' name="' + attributes.name + '">';
      delete attributes.name;
      return Element.writeAttribute(document.createElement(tagName), attributes);
    }
 
    if (!ELEMENT_CACHE[tagName])
      ELEMENT_CACHE[tagName] = Element.extend(document.createElement(tagName));
 
    var node = shouldUseCreationCache(tagName, attributes) ?
     ELEMENT_CACHE[tagName].cloneNode(false) : document.createElement(tagName);
 
    return Element.writeAttribute(node, attributes);
  }
 
  GLOBAL.Element = Element;
 
  Object.extend(GLOBAL.Element, oldElement || {});
  if (oldElement) GLOBAL.Element.prototype = oldElement.prototype;
 
  Element.Methods = { ByTag: {}, Simulated: {} };
 
  var methods = {};
 
  var INSPECT_ATTRIBUTES = { id: 'id', className: 'class' };
  function inspect(element) {
    element = $(element);
    var result = '<' + element.tagName.toLowerCase();
 
    var attribute, value;
    for (var property in INSPECT_ATTRIBUTES) {
      attribute = INSPECT_ATTRIBUTES[property];
      value = (element[property] || '').toString();
      if (value) result += ' ' + attribute + '=' + value.inspect(true);
    }
 
    return result + '>';
  }
 
  methods.inspect = inspect;
 
 
  function visible(element) {
    return $(element).style.display !== 'none';
  }
 
  function toggle(element, bool) {
    element = $(element);
    if (Object.isUndefined(bool))
      bool = !Element.visible(element);
    Element[bool ? 'show' : 'hide'](element);
 
    return element;
  }
 
  function hide(element) {
    element = $(element);
    element.style.display = 'none';
    return element;
  }
 
  function show(element) {
    element = $(element);
    element.style.display = '';
    return element;
  }
 
 
  Object.extend(methods, {
    visible: visible,
    toggle:  toggle,
    hide:    hide,
    show:    show
  });
 
 
  function remove(element) {
    element = $(element);
    element.parentNode.removeChild(element);
    return element;
  }
 
  var SELECT_ELEMENT_INNERHTML_BUGGY = (function(){
    var el = document.createElement("select"),
        isBuggy = true;
    el.innerHTML = "<option value=\"test\">test</option>";
    if (el.options && el.options[0]) {
      isBuggy = el.options[0].nodeName.toUpperCase() !== "OPTION";
    }
    el = null;
    return isBuggy;
  })();
 
  var TABLE_ELEMENT_INNERHTML_BUGGY = (function(){
    try {
      var el = document.createElement("table");
      if (el && el.tBodies) {
        el.innerHTML = "<tbody><tr><td>test</td></tr></tbody>";
        var isBuggy = typeof el.tBodies[0] == "undefined";
        el = null;
        return isBuggy;
      }
    } catch (e) {
      return true;
    }
  })();
 
  var LINK_ELEMENT_INNERHTML_BUGGY = (function() {
    try {
      var el = document.createElement('div');
      el.innerHTML = "<link />";
      var isBuggy = (el.childNodes.length === 0);
      el = null;
      return isBuggy;
    } catch(e) {
      return true;
    }
  })();
 
  var ANY_INNERHTML_BUGGY = SELECT_ELEMENT_INNERHTML_BUGGY ||
   TABLE_ELEMENT_INNERHTML_BUGGY || LINK_ELEMENT_INNERHTML_BUGGY;
 
  var SCRIPT_ELEMENT_REJECTS_TEXTNODE_APPENDING = (function () {
    var s = document.createElement("script"),
        isBuggy = false;
    try {
      s.appendChild(document.createTextNode(""));
      isBuggy = !s.firstChild ||
        s.firstChild && s.firstChild.nodeType !== 3;
    } catch (e) {
      isBuggy = true;
    }
    s = null;
    return isBuggy;
  })();
 
  function update(element, content) {
    element = $(element);
 
    var descendants = element.getElementsByTagName('*'),
     i = descendants.length;
    while (i--) purgeElement(descendants[i]);
 
    if (content && content.toElement)
      content = content.toElement();
 
    if (Object.isElement(content))
      return element.update().insert(content);
 
 
    content = Object.toHTML(content);
    var tagName = element.tagName.toUpperCase();
 
    if (tagName === 'SCRIPT' && SCRIPT_ELEMENT_REJECTS_TEXTNODE_APPENDING) {
      element.text = content;
      return element;
    }
 
    if (ANY_INNERHTML_BUGGY) {
      if (tagName in INSERTION_TRANSLATIONS.tags) {
        while (element.firstChild)
          element.removeChild(element.firstChild);
 
        var nodes = getContentFromAnonymousElement(tagName, content.stripScripts());
        for (var i = 0, node; node = nodes[i]; i++)
          element.appendChild(node);
 
      } else if (LINK_ELEMENT_INNERHTML_BUGGY && Object.isString(content) && content.indexOf('<link') > -1) {
        while (element.firstChild)
          element.removeChild(element.firstChild);
 
        var nodes = getContentFromAnonymousElement(tagName,
         content.stripScripts(), true);
 
        for (var i = 0, node; node = nodes[i]; i++)
          element.appendChild(node);
      } else {
        element.innerHTML = content.stripScripts();
      }
    } else {
      element.innerHTML = content.stripScripts();
    }
 
    content.evalScripts.bind(content).defer();
    return element;
  }
 
  function replace(element, content) {
    element = $(element);
 
    if (content && content.toElement) {
      content = content.toElement();
    } else if (!Object.isElement(content)) {
      content = Object.toHTML(content);
      var range = element.ownerDocument.createRange();
      range.selectNode(element);
      content.evalScripts.bind(content).defer();
      content = range.createContextualFragment(content.stripScripts());
    }
 
    element.parentNode.replaceChild(content, element);
    return element;
  }
 
  var INSERTION_TRANSLATIONS = {
    before: function(element, node) {
      element.parentNode.insertBefore(node, element);
    },
    top: function(element, node) {
      element.insertBefore(node, element.firstChild);
    },
    bottom: function(element, node) {
      element.appendChild(node);
    },
    after: function(element, node) {
      element.parentNode.insertBefore(node, element.nextSibling);
    },
 
    tags: {
      TABLE:  ['<table>',                '</table>',                   1],
      TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
      TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
      TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
      SELECT: ['<select>',               '</select>',                  1]
    }
  };
 
  var tags = INSERTION_TRANSLATIONS.tags;
 
  Object.extend(tags, {
    THEAD: tags.TBODY,
    TFOOT: tags.TBODY,
    TH:    tags.TD
  });
 
  function replace_IE(element, content) {
    element = $(element);
    if (content && content.toElement)
      content = content.toElement();
    if (Object.isElement(content)) {
      element.parentNode.replaceChild(content, element);
      return element;
    }
 
    content = Object.toHTML(content);
    var parent = element.parentNode, tagName = parent.tagName.toUpperCase();
 
    if (tagName in INSERTION_TRANSLATIONS.tags) {
      var nextSibling = Element.next(element);
      var fragments = getContentFromAnonymousElement(
       tagName, content.stripScripts());
 
      parent.removeChild(element);
 
      var iterator;
      if (nextSibling)
        iterator = function(node) { parent.insertBefore(node, nextSibling) };
      else
        iterator = function(node) { parent.appendChild(node); }
 
      fragments.each(iterator);
    } else {
      element.outerHTML = content.stripScripts();
    }
 
    content.evalScripts.bind(content).defer();
    return element;
  }
 
  if ('outerHTML' in document.documentElement)
    replace = replace_IE;
 
  function isContent(content) {
    if (Object.isUndefined(content) || content === null) return false;
 
    if (Object.isString(content) || Object.isNumber(content)) return true;
    if (Object.isElement(content)) return true;
    if (content.toElement || content.toHTML) return true;
 
    return false;
  }
 
  function insertContentAt(element, content, position) {
    position   = position.toLowerCase();
    var method = INSERTION_TRANSLATIONS[position];
 
    if (content && content.toElement) content = content.toElement();
    if (Object.isElement(content)) {
      method(element, content);
      return element;
    }
 
    content = Object.toHTML(content);
    var tagName = ((position === 'before' || position === 'after') ?
     element.parentNode : element).tagName.toUpperCase();
 
    var childNodes = getContentFromAnonymousElement(tagName, content.stripScripts());
 
    if (position === 'top' || position === 'after') childNodes.reverse();
 
    for (var i = 0, node; node = childNodes[i]; i++)
      method(element, node);
 
    content.evalScripts.bind(content).defer();
  }
 
  function insert(element, insertions) {
    element = $(element);
 
    if (isContent(insertions))
      insertions = { bottom: insertions };
 
    for (var position in insertions)
      insertContentAt(element, insertions[position], position);
 
    return element;
  }
 
  function wrap(element, wrapper, attributes) {
    element = $(element);
 
    if (Object.isElement(wrapper)) {
      $(wrapper).writeAttribute(attributes || {});
    } else if (Object.isString(wrapper)) {
      wrapper = new Element(wrapper, attributes);
    } else {
      wrapper = new Element('div', wrapper);
    }
 
    if (element.parentNode)
      element.parentNode.replaceChild(wrapper, element);
 
    wrapper.appendChild(element);
 
    return wrapper;
  }
 
  function cleanWhitespace(element) {
    element = $(element);
    var node = element.firstChild;
 
    while (node) {
      var nextNode = node.nextSibling;
      if (node.nodeType === Node.TEXT_NODE && !/\S/.test(node.nodeValue))
        element.removeChild(node);
      node = nextNode;
    }
    return element;
  }
 
  function empty(element) {
    return $(element).innerHTML.blank();
  }
 
  function getContentFromAnonymousElement(tagName, html, force) {
    var t = INSERTION_TRANSLATIONS.tags[tagName], div = DIV;
 
    var workaround = !!t;
    if (!workaround && force) {
      workaround = true;
      t = ['', '', 0];
    }
 
    if (workaround) {
      div.innerHTML = '&#160;' + t[0] + html + t[1];
      div.removeChild(div.firstChild);
      for (var i = t[2]; i--; )
        div = div.firstChild;
    } else {
      div.innerHTML = html;
    }
 
    return $A(div.childNodes);
  }
 
  function clone(element, deep) {
    if (!(element = $(element))) return;
    var clone = element.cloneNode(deep);
    if (!HAS_UNIQUE_ID_PROPERTY) {
      clone._prototypeUID = UNDEFINED;
      if (deep) {
        var descendants = Element.select(clone, '*'),
         i = descendants.length;
        while (i--)
          descendants[i]._prototypeUID = UNDEFINED;
      }
    }
    return Element.extend(clone);
  }
 
  function purgeElement(element) {
    var uid = getUniqueElementID(element);
    if (uid) {
      Element.stopObserving(element);
      if (!HAS_UNIQUE_ID_PROPERTY)
        element._prototypeUID = UNDEFINED;
      delete Element.Storage[uid];
    }
  }
 
  function purgeCollection(elements) {
    var i = elements.length;
    while (i--)
      purgeElement(elements[i]);
  }
 
  function purgeCollection_IE(elements) {
    var i = elements.length, element, uid;
    while (i--) {
      element = elements[i];
      uid = getUniqueElementID(element);
      delete Element.Storage[uid];
      delete Event.cache[uid];
    }
  }
 
  if (HAS_UNIQUE_ID_PROPERTY) {
    purgeCollection = purgeCollection_IE;
  }
 
 
  function purge(element) {
    if (!(element = $(element))) return;
    purgeElement(element);
 
    var descendants = element.getElementsByTagName('*'),
     i = descendants.length;
 
    while (i--) purgeElement(descendants[i]);
 
    return null;
  }
 
  Object.extend(methods, {
    remove:  remove,
    update:  update,
    replace: replace,
    insert:  insert,
    wrap:    wrap,
    cleanWhitespace: cleanWhitespace,
    empty:   empty,
    clone:   clone,
    purge:   purge
  });
 
 
 
  function recursivelyCollect(element, property, maximumLength) {
    element = $(element);
    maximumLength = maximumLength || -1;
    var elements = [];
 
    while (element = element[property]) {
      if (element.nodeType === Node.ELEMENT_NODE)
        elements.push(Element.extend(element));
 
      if (elements.length === maximumLength) break;
    }
 
    return elements;
  }
 
 
  function ancestors(element) {
    return recursivelyCollect(element, 'parentNode');
  }
 
  function descendants(element) {
    return Element.select(element, '*');
  }
 
  function firstDescendant(element) {
    element = $(element).firstChild;
    while (element && element.nodeType !== Node.ELEMENT_NODE)
      element = element.nextSibling;
 
    return $(element);
  }
 
  function immediateDescendants(element) {
    var results = [], child = $(element).firstChild;
 
    while (child) {
      if (child.nodeType === Node.ELEMENT_NODE)
        results.push(Element.extend(child));
 
      child = child.nextSibling;
    }
 
    return results;
  }
 
  function previousSiblings(element) {
    return recursivelyCollect(element, 'previousSibling');
  }
 
  function nextSiblings(element) {
    return recursivelyCollect(element, 'nextSibling');
  }
 
  function siblings(element) {
    element = $(element);
    var previous = previousSiblings(element),
     next = nextSiblings(element);
    return previous.reverse().concat(next);
  }
 
  function match(element, selector) {
    element = $(element);
 
    if (Object.isString(selector))
      return Prototype.Selector.match(element, selector);
 
    return selector.match(element);
  }
 
 
  function _recursivelyFind(element, property, expression, index) {
    element = $(element), expression = expression || 0, index = index || 0;
    if (Object.isNumber(expression)) {
      index = expression, expression = null;
    }
 
    while (element = element[property]) {
      if (element.nodeType !== 1) continue;
      if (expression && !Prototype.Selector.match(element, expression))
        continue;
      if (--index >= 0) continue;
 
      return Element.extend(element);
    }
  }
 
 
  function up(element, expression, index) {
    element = $(element);
 
    if (arguments.length === 1) return $(element.parentNode);
    return _recursivelyFind(element, 'parentNode', expression, index);
  }
 
  function down(element, expression, index) {
    if (arguments.length === 1) return firstDescendant(element);
    element = $(element), expression = expression || 0, index = index || 0;
 
    if (Object.isNumber(expression))
      index = expression, expression = '*';
 
    var node = Prototype.Selector.select(expression, element)[index];
    return Element.extend(node);
  }
 
  function previous(element, expression, index) {
    return _recursivelyFind(element, 'previousSibling', expression, index);
  }
 
  function next(element, expression, index) {
    return _recursivelyFind(element, 'nextSibling', expression, index);
  }
 
  function select(element) {
    element = $(element);
    var expressions = SLICE.call(arguments, 1).join(', ');
    return Prototype.Selector.select(expressions, element);
  }
 
  function adjacent(element) {
    element = $(element);
    var expressions = SLICE.call(arguments, 1).join(', ');
    var siblings = Element.siblings(element), results = [];
    for (var i = 0, sibling; sibling = siblings[i]; i++) {
      if (Prototype.Selector.match(sibling, expressions))
        results.push(sibling);
    }
 
    return results;
  }
 
  function descendantOf_DOM(element, ancestor) {
    element = $(element), ancestor = $(ancestor);
    while (element = element.parentNode)
      if (element === ancestor) return true;
    return false;
  }
 
  function descendantOf_contains(element, ancestor) {
    element = $(element), ancestor = $(ancestor);
    if (!ancestor.contains) return descendantOf_DOM(element, ancestor);
    return ancestor.contains(element) && ancestor !== element;
  }
 
  function descendantOf_compareDocumentPosition(element, ancestor) {
    element = $(element), ancestor = $(ancestor);
    return (element.compareDocumentPosition(ancestor) & 8) === 8;
  }
 
  var descendantOf;
  if (DIV.compareDocumentPosition) {
    descendantOf = descendantOf_compareDocumentPosition;
  } else if (DIV.contains) {
    descendantOf = descendantOf_contains;
  } else {
    descendantOf = descendantOf_DOM;
  }
 
 
  Object.extend(methods, {
    recursivelyCollect:   recursivelyCollect,
    ancestors:            ancestors,
    descendants:          descendants,
    firstDescendant:      firstDescendant,
    immediateDescendants: immediateDescendants,
    previousSiblings:     previousSiblings,
    nextSiblings:         nextSiblings,
    siblings:             siblings,
    match:                match,
    up:                   up,
    down:                 down,
    previous:             previous,
    next:                 next,
    select:               select,
    adjacent:             adjacent,
    descendantOf:         descendantOf,
 
    getElementsBySelector: select,
 
    childElements:         immediateDescendants
  });
 
 
  var idCounter = 1;
  function identify(element) {
    element = $(element);
    var id = Element.readAttribute(element, 'id');
    if (id) return id;
 
    do { id = 'anonymous_element_' + idCounter++ } while ($(id));
 
    Element.writeAttribute(element, 'id', id);
    return id;
  }
 
 
  function readAttribute(element, name) {
    return $(element).getAttribute(name);
  }
 
  function readAttribute_IE(element, name) {
    element = $(element);
 
    var table = ATTRIBUTE_TRANSLATIONS.read;
    if (table.values[name])
      return table.values[name](element, name);
 
    if (table.names[name]) name = table.names[name];
 
    if (name.include(':')) {
      if (!element.attributes || !element.attributes[name]) return null;
      return element.attributes[name].value;
    }
 
    return element.getAttribute(name);
  }
 
  function readAttribute_Opera(element, name) {
    if (name === 'title') return element.title;
    return element.getAttribute(name);
  }
 
  var PROBLEMATIC_ATTRIBUTE_READING = (function() {
    DIV.setAttribute('onclick', []);
    var value = DIV.getAttribute('onclick');
    var isFunction = Object.isArray(value);
    DIV.removeAttribute('onclick');
    return isFunction;
  })();
 
  if (PROBLEMATIC_ATTRIBUTE_READING) {
    readAttribute = readAttribute_IE;
  } else if (Prototype.Browser.Opera) {
    readAttribute = readAttribute_Opera;
  }
 
 
  function writeAttribute(element, name, value) {
    element = $(element);
    var attributes = {}, table = ATTRIBUTE_TRANSLATIONS.write;
 
    if (typeof name === 'object') {
      attributes = name;
    } else {
      attributes[name] = Object.isUndefined(value) ? true : value;
    }
 
    for (var attr in attributes) {
      name = table.names[attr] || attr;
      value = attributes[attr];
      if (table.values[attr])
        name = table.values[attr](element, value) || name;
      if (value === false || value === null)
        element.removeAttribute(name);
      else if (value === true)
        element.setAttribute(name, name);
      else element.setAttribute(name, value);
    }
 
    return element;
  }
 
  var PROBLEMATIC_HAS_ATTRIBUTE_WITH_CHECKBOXES = (function () {
    if (!HAS_EXTENDED_CREATE_ELEMENT_SYNTAX) {
      return false;
    }
    var checkbox = document.createElement('<input type="checkbox">');
    checkbox.checked = true;
    var node = checkbox.getAttributeNode('checked');
    return !node || !node.specified;
  })();
 
  function hasAttribute(element, attribute) {
    attribute = ATTRIBUTE_TRANSLATIONS.has[attribute] || attribute;
    var node = $(element).getAttributeNode(attribute);
    return !!(node && node.specified);
  }
 
  function hasAttribute_IE(element, attribute) {
    if (attribute === 'checked') {
      return element.checked;
    }
    return hasAttribute(element, attribute);
  }
 
  GLOBAL.Element.Methods.Simulated.hasAttribute =
   PROBLEMATIC_HAS_ATTRIBUTE_WITH_CHECKBOXES ?
   hasAttribute_IE : hasAttribute;
 
  function classNames(element) {
    return new Element.ClassNames(element);
  }
 
  var regExpCache = {};
  function getRegExpForClassName(className) {
    if (regExpCache[className]) return regExpCache[className];
 
    var re = new RegExp("(^|\\s+)" + className + "(\\s+|$)");
    regExpCache[className] = re;
    return re;
  }
 
  function hasClassName(element, className) {
    if (!(element = $(element))) return;
 
    var elementClassName = element.className;
 
    if (elementClassName.length === 0) return false;
    if (elementClassName === className) return true;
 
    return getRegExpForClassName(className).test(elementClassName);
  }
 
  function addClassName(element, className) {
    if (!(element = $(element))) return;
 
    if (!hasClassName(element, className))
      element.className += (element.className ? ' ' : '') + className;
 
    return element;
  }
 
  function removeClassName(element, className) {
    if (!(element = $(element))) return;
 
    element.className = element.className.replace(
     getRegExpForClassName(className), ' ').strip();
 
    return element;
  }
 
  function toggleClassName(element, className, bool) {
    if (!(element = $(element))) return;
 
    if (Object.isUndefined(bool))
      bool = !hasClassName(element, className);
 
    var method = Element[bool ? 'addClassName' : 'removeClassName'];
    return method(element, className);
  }
 
  var ATTRIBUTE_TRANSLATIONS = {};
 
  var classProp = 'className', forProp = 'for';
 
  DIV.setAttribute(classProp, 'x');
  if (DIV.className !== 'x') {
    DIV.setAttribute('class', 'x');
    if (DIV.className === 'x')
      classProp = 'class';
  }
 
  var LABEL = document.createElement('label');
  LABEL.setAttribute(forProp, 'x');
  if (LABEL.htmlFor !== 'x') {
    LABEL.setAttribute('htmlFor', 'x');
    if (LABEL.htmlFor === 'x')
      forProp = 'htmlFor';
  }
  LABEL = null;
 
  function _getAttr(element, attribute) {
    return element.getAttribute(attribute);
  }
 
  function _getAttr2(element, attribute) {
    return element.getAttribute(attribute, 2);
  }
 
  function _getAttrNode(element, attribute) {
    var node = element.getAttributeNode(attribute);
    return node ? node.value : '';
  }
 
  function _getFlag(element, attribute) {
    return $(element).hasAttribute(attribute) ? attribute : null;
  }
 
  DIV.onclick = Prototype.emptyFunction;
  var onclickValue = DIV.getAttribute('onclick');
 
  var _getEv;
 
  if (String(onclickValue).indexOf('{') > -1) {
    _getEv = function(element, attribute) {
      var value = element.getAttribute(attribute);
      if (!value) return null;
      value = value.toString();
      value = value.split('{')[1];
      value = value.split('}')[0];
      return value.strip();
    };
  }
  else if (onclickValue === '') {
    _getEv = function(element, attribute) {
      var value = element.getAttribute(attribute);
      if (!value) return null;
      return value.strip();
    };
  }
 
  ATTRIBUTE_TRANSLATIONS.read = {
    names: {
      'class':     classProp,
      'className': classProp,
      'for':       forProp,
      'htmlFor':   forProp
    },
 
    values: {
      style: function(element) {
        return element.style.cssText.toLowerCase();
      },
      title: function(element) {
        return element.title;
      }
    }
  };
 
  ATTRIBUTE_TRANSLATIONS.write = {
    names: {
      className:   'class',
      htmlFor:     'for',
      cellpadding: 'cellPadding',
      cellspacing: 'cellSpacing'
    },
 
    values: {
      checked: function(element, value) {
        element.checked = !!value;
      },
 
      style: function(element, value) {
        element.style.cssText = value ? value : '';
      }
    }
  };
 
  ATTRIBUTE_TRANSLATIONS.has = { names: {} };
 
  Object.extend(ATTRIBUTE_TRANSLATIONS.write.names,
   ATTRIBUTE_TRANSLATIONS.read.names);
 
  var CAMEL_CASED_ATTRIBUTE_NAMES = $w('colSpan rowSpan vAlign dateTime ' +
   'accessKey tabIndex encType maxLength readOnly longDesc frameBorder');
 
  for (var i = 0, attr; attr = CAMEL_CASED_ATTRIBUTE_NAMES[i]; i++) {
    ATTRIBUTE_TRANSLATIONS.write.names[attr.toLowerCase()] = attr;
    ATTRIBUTE_TRANSLATIONS.has.names[attr.toLowerCase()]   = attr;
  }
 
  Object.extend(ATTRIBUTE_TRANSLATIONS.read.values, {
    href:        _getAttr2,
    src:         _getAttr2,
    type:        _getAttr,
    action:      _getAttrNode,
    disabled:    _getFlag,
    checked:     _getFlag,
    readonly:    _getFlag,
    multiple:    _getFlag,
    onload:      _getEv,
    onunload:    _getEv,
    onclick:     _getEv,
    ondblclick:  _getEv,
    onmousedown: _getEv,
    onmouseup:   _getEv,
    onmouseover: _getEv,
    onmousemove: _getEv,
    onmouseout:  _getEv,
    onfocus:     _getEv,
    onblur:      _getEv,
    onkeypress:  _getEv,
    onkeydown:   _getEv,
    onkeyup:     _getEv,
    onsubmit:    _getEv,
    onreset:     _getEv,
    onselect:    _getEv,
    onchange:    _getEv
  });
 
 
  Object.extend(methods, {
    identify:        identify,
    readAttribute:   readAttribute,
    writeAttribute:  writeAttribute,
    classNames:      classNames,
    hasClassName:    hasClassName,
    addClassName:    addClassName,
    removeClassName: removeClassName,
    toggleClassName: toggleClassName
  });
 
 
  function normalizeStyleName(style) {
    if (style === 'float' || style === 'styleFloat')
      return 'cssFloat';
    return style.camelize();
  }
 
  function normalizeStyleName_IE(style) {
    if (style === 'float' || style === 'cssFloat')
      return 'styleFloat';
    return style.camelize();
  }
 
  function setStyle(element, styles) {
    element = $(element);
    var elementStyle = element.style, match;
 
    if (Object.isString(styles)) {
      elementStyle.cssText += ';' + styles;
      if (styles.include('opacity')) {
        var opacity = styles.match(/opacity:\s*(\d?\.?\d*)/)[1];
        Element.setOpacity(element, opacity);
      }
      return element;
    }
 
    for (var property in styles) {
      if (property === 'opacity') {
        Element.setOpacity(element, styles[property]);
      } else {
        var value = styles[property];
        if (property === 'float' || property === 'cssFloat') {
          property = Object.isUndefined(elementStyle.styleFloat) ?
           'cssFloat' : 'styleFloat';
        }
        elementStyle[property] = value;
      }
    }
 
    return element;
  }
 
 
  function getStyle(element, style) {
    element = $(element);
    style = normalizeStyleName(style);
 
    var value = element.style[style];
    if (!value || value === 'auto') {
      var css = document.defaultView.getComputedStyle(element, null);
      value = css ? css[style] : null;
    }
 
    if (style === 'opacity') return value ? parseFloat(value) : 1.0;
    return value === 'auto' ? null : value;
  }
 
  function getStyle_Opera(element, style) {
    switch (style) {
      case 'height': case 'width':
        if (!Element.visible(element)) return null;
 
        var dim = parseInt(getStyle(element, style), 10);
 
        if (dim !== element['offset' + style.capitalize()])
          return dim + 'px';
 
        return Element.measure(element, style);
 
      default: return getStyle(element, style);
    }
  }
 
  function getStyle_IE(element, style) {
    element = $(element);
    style = normalizeStyleName_IE(style);
 
    var value = element.style[style];
    if (!value && element.currentStyle) {
      value = element.currentStyle[style];
    }
 
    if (style === 'opacity' && !STANDARD_CSS_OPACITY_SUPPORTED)
      return getOpacity_IE(element);
 
    if (value === 'auto') {
      if ((style === 'width' || style === 'height') && Element.visible(element))
        return Element.measure(element, style) + 'px';
      return null;
    }
 
    return value;
  }
 
  function stripAlphaFromFilter_IE(filter) {
    return (filter || '').replace(/alpha\‍([^\‍)]*\‍)/gi, '');
  }
 
  function hasLayout_IE(element) {
    if (!element.currentStyle || !element.currentStyle.hasLayout)
      element.style.zoom = 1;
    return element;
  }
 
  var STANDARD_CSS_OPACITY_SUPPORTED = (function() {
    DIV.style.cssText = "opacity:.55";
    return /^0.55/.test(DIV.style.opacity);
  })();
 
  function setOpacity(element, value) {
    element = $(element);
    if (value == 1 || value === '') value = '';
    else if (value < 0.00001) value = 0;
    element.style.opacity = value;
    return element;
  }
 
  function setOpacity_IE(element, value) {
    if (STANDARD_CSS_OPACITY_SUPPORTED)
      return setOpacity(element, value);
 
    element = hasLayout_IE($(element));
    var filter = Element.getStyle(element, 'filter'),
     style = element.style;
 
    if (value == 1 || value === '') {
      filter = stripAlphaFromFilter_IE(filter);
      if (filter) style.filter = filter;
      else style.removeAttribute('filter');
      return element;
    }
 
    if (value < 0.00001) value = 0;
 
    style.filter = stripAlphaFromFilter_IE(filter) +
     'alpha(opacity=' + (value * 100) + ')';
 
    return element;
  }
 
 
  function getOpacity(element) {
    return Element.getStyle(element, 'opacity');
  }
 
  function getOpacity_IE(element) {
    if (STANDARD_CSS_OPACITY_SUPPORTED)
      return getOpacity(element);
 
    var filter = Element.getStyle(element, 'filter');
    if (filter.length === 0) return 1.0;
    var match = (filter || '').match(/alpha\‍(opacity=(.*)\‍)/);
    if (match && match[1]) return parseFloat(match[1]) / 100;
    return 1.0;
  }
 
 
  Object.extend(methods, {
    setStyle:   setStyle,
    getStyle:   getStyle,
    setOpacity: setOpacity,
    getOpacity: getOpacity
  });
 
  if ('styleFloat' in DIV.style) {
    methods.getStyle = getStyle_IE;
    methods.setOpacity = setOpacity_IE;
    methods.getOpacity = getOpacity_IE;
  }
 
  var UID = 0;
 
  GLOBAL.Element.Storage = { UID: 1 };
 
  function getUniqueElementID(element) {
    if (element === window) return 0;
 
    if (typeof element._prototypeUID === 'undefined')
      element._prototypeUID = Element.Storage.UID++;
    return element._prototypeUID;
  }
 
  function getUniqueElementID_IE(element) {
    if (element === window) return 0;
    if (element == document) return 1;
    return element.uniqueID;
  }
 
  var HAS_UNIQUE_ID_PROPERTY = ('uniqueID' in DIV);
  if (HAS_UNIQUE_ID_PROPERTY)
    getUniqueElementID = getUniqueElementID_IE;
 
  function getStorage(element) {
    if (!(element = $(element))) return;
 
    var uid = getUniqueElementID(element);
 
    if (!Element.Storage[uid])
      Element.Storage[uid] = $H();
 
    return Element.Storage[uid];
  }
 
  function store(element, key, value) {
    if (!(element = $(element))) return;
    var storage = getStorage(element);
    if (arguments.length === 2) {
      storage.update(key);
    } else {
      storage.set(key, value);
    }
    return element;
  }
 
  function retrieve(element, key, defaultValue) {
    if (!(element = $(element))) return;
    var storage = getStorage(element), value = storage.get(key);
 
    if (Object.isUndefined(value)) {
      storage.set(key, defaultValue);
      value = defaultValue;
    }
 
    return value;
  }
 
 
  Object.extend(methods, {
    getStorage: getStorage,
    store:      store,
    retrieve:   retrieve
  });
 
 
  var Methods = {}, ByTag = Element.Methods.ByTag,
   F = Prototype.BrowserFeatures;
 
  if (!F.ElementExtensions && ('__proto__' in DIV)) {
    GLOBAL.HTMLElement = {};
    GLOBAL.HTMLElement.prototype = DIV['__proto__'];
    F.ElementExtensions = true;
  }
 
  function checkElementPrototypeDeficiency(tagName) {
    if (typeof window.Element === 'undefined') return false;
    if (!HAS_EXTENDED_CREATE_ELEMENT_SYNTAX) return false;
    var proto = window.Element.prototype;
    if (proto) {
      var id = '_' + (Math.random() + '').slice(2),
       el = document.createElement(tagName);
      proto[id] = 'x';
      var isBuggy = (el[id] !== 'x');
      delete proto[id];
      el = null;
      return isBuggy;
    }
 
    return false;
  }
 
  var HTMLOBJECTELEMENT_PROTOTYPE_BUGGY =
   checkElementPrototypeDeficiency('object');
 
  function extendElementWith(element, methods) {
    for (var property in methods) {
      var value = methods[property];
      if (Object.isFunction(value) && !(property in element))
        element[property] = value.methodize();
    }
  }
 
  var EXTENDED = {};
  function elementIsExtended(element) {
    var uid = getUniqueElementID(element);
    return (uid in EXTENDED);
  }
 
  function extend(element) {
    if (!element || elementIsExtended(element)) return element;
    if (element.nodeType !== Node.ELEMENT_NODE || element == window)
      return element;
 
    var methods = Object.clone(Methods),
     tagName = element.tagName.toUpperCase();
 
    if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);
 
    extendElementWith(element, methods);
    EXTENDED[getUniqueElementID(element)] = true;
    return element;
  }
 
  function extend_IE8(element) {
    if (!element || elementIsExtended(element)) return element;
 
    var t = element.tagName;
    if (t && (/^(?:object|applet|embed)$/i.test(t))) {
      extendElementWith(element, Element.Methods);
      extendElementWith(element, Element.Methods.Simulated);
      extendElementWith(element, Element.Methods.ByTag[t.toUpperCase()]);
    }
 
    return element;
  }
 
  if (F.SpecificElementExtensions) {
    extend = HTMLOBJECTELEMENT_PROTOTYPE_BUGGY ? extend_IE8 : Prototype.K;
  }
 
  function addMethodsToTagName(tagName, methods) {
    tagName = tagName.toUpperCase();
    if (!ByTag[tagName]) ByTag[tagName] = {};
    Object.extend(ByTag[tagName], methods);
  }
 
  function mergeMethods(destination, methods, onlyIfAbsent) {
    if (Object.isUndefined(onlyIfAbsent)) onlyIfAbsent = false;
    for (var property in methods) {
      var value = methods[property];
      if (!Object.isFunction(value)) continue;
      if (!onlyIfAbsent || !(property in destination))
        destination[property] = value.methodize();
    }
  }
 
  function findDOMClass(tagName) {
    var klass;
    var trans = {
      "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
      "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
      "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
      "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
      "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
      "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
      "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
      "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
      "FrameSet", "IFRAME": "IFrame"
    };
    if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
    if (window[klass]) return window[klass];
    klass = 'HTML' + tagName + 'Element';
    if (window[klass]) return window[klass];
    klass = 'HTML' + tagName.capitalize() + 'Element';
    if (window[klass]) return window[klass];
 
    var element = document.createElement(tagName),
     proto = element['__proto__'] || element.constructor.prototype;
 
    element = null;
    return proto;
  }
 
  function addMethods(methods) {
    if (arguments.length === 0) addFormMethods();
 
    if (arguments.length === 2) {
      var tagName = methods;
      methods = arguments[1];
    }
 
    if (!tagName) {
      Object.extend(Element.Methods, methods || {});
    } else {
      if (Object.isArray(tagName)) {
        for (var i = 0, tag; tag = tagName[i]; i++)
          addMethodsToTagName(tag, methods);
      } else {
        addMethodsToTagName(tagName, methods);
      }
    }
 
    var ELEMENT_PROTOTYPE = window.HTMLElement ? HTMLElement.prototype :
     Element.prototype;
 
    if (F.ElementExtensions) {
      mergeMethods(ELEMENT_PROTOTYPE, Element.Methods);
      mergeMethods(ELEMENT_PROTOTYPE, Element.Methods.Simulated, true);
    }
 
    if (F.SpecificElementExtensions) {
      for (var tag in Element.Methods.ByTag) {
        var klass = findDOMClass(tag);
        if (Object.isUndefined(klass)) continue;
        mergeMethods(klass.prototype, ByTag[tag]);
      }
    }
 
    Object.extend(Element, Element.Methods);
    Object.extend(Element, Element.Methods.Simulated);
    delete Element.ByTag;
    delete Element.Simulated;
 
    Element.extend.refresh();
 
    ELEMENT_CACHE = {};
  }
 
  Object.extend(GLOBAL.Element, {
    extend:     extend,
    addMethods: addMethods
  });
 
  if (extend === Prototype.K) {
    GLOBAL.Element.extend.refresh = Prototype.emptyFunction;
  } else {
    GLOBAL.Element.extend.refresh = function() {
      if (Prototype.BrowserFeatures.ElementExtensions) return;
      Object.extend(Methods, Element.Methods);
      Object.extend(Methods, Element.Methods.Simulated);
 
      EXTENDED = {};
    };
  }
 
  function addFormMethods() {
    Object.extend(Form, Form.Methods);
    Object.extend(Form.Element, Form.Element.Methods);
    Object.extend(Element.Methods.ByTag, {
      "FORM":     Object.clone(Form.Methods),
      "INPUT":    Object.clone(Form.Element.Methods),
      "SELECT":   Object.clone(Form.Element.Methods),
      "TEXTAREA": Object.clone(Form.Element.Methods),
      "BUTTON":   Object.clone(Form.Element.Methods)
    });
  }
 
  Element.addMethods(methods);
 
  function destroyCache_IE() {
    DIV = null;
    ELEMENT_CACHE = null;
  }
 
  if (window.attachEvent)
    window.attachEvent('onunload', destroyCache_IE);
 
})(this);
(function() {
 
  function toDecimal(pctString) {
    var match = pctString.match(/^(\d+)%?$/i);
    if (!match) return null;
    return (Number(match[1]) / 100);
  }
 
  function getRawStyle(element, style) {
    element = $(element);
 
    var value = element.style[style];
    if (!value || value === 'auto') {
      var css = document.defaultView.getComputedStyle(element, null);
      value = css ? css[style] : null;
    }
 
    if (style === 'opacity') return value ? parseFloat(value) : 1.0;
    return value === 'auto' ? null : value;
  }
 
  function getRawStyle_IE(element, style) {
    var value = element.style[style];
    if (!value && element.currentStyle) {
      value = element.currentStyle[style];
    }
    return value;
  }
 
  function getContentWidth(element, context) {
    var boxWidth = element.offsetWidth;
 
    var bl = getPixelValue(element, 'borderLeftWidth',  context) || 0;
    var br = getPixelValue(element, 'borderRightWidth', context) || 0;
    var pl = getPixelValue(element, 'paddingLeft',      context) || 0;
    var pr = getPixelValue(element, 'paddingRight',     context) || 0;
 
    return boxWidth - bl - br - pl - pr;
  }
 
  if ('currentStyle' in document.documentElement) {
    getRawStyle = getRawStyle_IE;
  }
 
 
  function getPixelValue(value, property, context) {
    var element = null;
    if (Object.isElement(value)) {
      element = value;
      value = getRawStyle(element, property);
    }
 
    if (value === null || Object.isUndefined(value)) {
      return null;
    }
 
    if ((/^(?:-)?\d+(\.\d+)?(px)?$/i).test(value)) {
      return window.parseFloat(value);
    }
 
    var isPercentage = value.include('%'), isViewport = (context === document.viewport);
 
    if (/\d/.test(value) && element && element.runtimeStyle && !(isPercentage && isViewport)) {
      var style = element.style.left, rStyle = element.runtimeStyle.left;
      element.runtimeStyle.left = element.currentStyle.left;
      element.style.left = value || 0;
      value = element.style.pixelLeft;
      element.style.left = style;
      element.runtimeStyle.left = rStyle;
 
      return value;
    }
 
    if (element && isPercentage) {
      context = context || element.parentNode;
      var decimal = toDecimal(value), whole = null;
 
      var isHorizontal = property.include('left') || property.include('right') ||
       property.include('width');
 
      var isVertical   = property.include('top') || property.include('bottom') ||
        property.include('height');
 
      if (context === document.viewport) {
        if (isHorizontal) {
          whole = document.viewport.getWidth();
        } else if (isVertical) {
          whole = document.viewport.getHeight();
        }
      } else {
        if (isHorizontal) {
          whole = $(context).measure('width');
        } else if (isVertical) {
          whole = $(context).measure('height');
        }
      }
 
      return (whole === null) ? 0 : whole * decimal;
    }
 
    return 0;
  }
 
  function toCSSPixels(number) {
    if (Object.isString(number) && number.endsWith('px'))
      return number;
    return number + 'px';
  }
 
  function isDisplayed(element) {
    while (element && element.parentNode) {
      var display = element.getStyle('display');
      if (display === 'none') {
        return false;
      }
      element = $(element.parentNode);
    }
    return true;
  }
 
  var hasLayout = Prototype.K;
  if ('currentStyle' in document.documentElement) {
    hasLayout = function(element) {
      if (!element.currentStyle.hasLayout) {
        element.style.zoom = 1;
      }
      return element;
    };
  }
 
  function cssNameFor(key) {
    if (key.include('border')) key = key + '-width';
    return key.camelize();
  }
 
  Element.Layout = Class.create(Hash, {
    initialize: function($super, element, preCompute) {
      $super();
      this.element = $(element);
 
      Element.Layout.PROPERTIES.each( function(property) {
        this._set(property, null);
      }, this);
 
      if (preCompute) {
        this._preComputing = true;
        this._begin();
        Element.Layout.PROPERTIES.each( this._compute, this );
        this._end();
        this._preComputing = false;
      }
    },
 
    _set: function(property, value) {
      return Hash.prototype.set.call(this, property, value);
    },
 
    set: function(property, value) {
      throw "Properties of Element.Layout are read-only.";
    },
 
    get: function($super, property) {
      var value = $super(property);
      return value === null ? this._compute(property) : value;
    },
 
    _begin: function() {
      if (this._isPrepared()) return;
 
      var element = this.element;
      if (isDisplayed(element)) {
        this._setPrepared(true);
        return;
      }
 
 
      var originalStyles = {
        position:   element.style.position   || '',
        width:      element.style.width      || '',
        visibility: element.style.visibility || '',
        display:    element.style.display    || ''
      };
 
      element.store('prototype_original_styles', originalStyles);
 
      var position = getRawStyle(element, 'position'), width = element.offsetWidth;
 
      if (width === 0 || width === null) {
        element.style.display = 'block';
        width = element.offsetWidth;
      }
 
      var context = (position === 'fixed') ? document.viewport :
       element.parentNode;
 
      var tempStyles = {
        visibility: 'hidden',
        display:    'block'
      };
 
      if (position !== 'fixed') tempStyles.position = 'absolute';
 
      element.setStyle(tempStyles);
 
      var positionedWidth = element.offsetWidth, newWidth;
      if (width && (positionedWidth === width)) {
        newWidth = getContentWidth(element, context);
      } else if (position === 'absolute' || position === 'fixed') {
        newWidth = getContentWidth(element, context);
      } else {
        var parent = element.parentNode, pLayout = $(parent).getLayout();
 
        newWidth = pLayout.get('width') -
         this.get('margin-left') -
         this.get('border-left') -
         this.get('padding-left') -
         this.get('padding-right') -
         this.get('border-right') -
         this.get('margin-right');
      }
 
      element.setStyle({ width: newWidth + 'px' });
 
      this._setPrepared(true);
    },
 
    _end: function() {
      var element = this.element;
      var originalStyles = element.retrieve('prototype_original_styles');
      element.store('prototype_original_styles', null);
      element.setStyle(originalStyles);
      this._setPrepared(false);
    },
 
    _compute: function(property) {
      var COMPUTATIONS = Element.Layout.COMPUTATIONS;
      if (!(property in COMPUTATIONS)) {
        throw "Property not found.";
      }
 
      return this._set(property, COMPUTATIONS[property].call(this, this.element));
    },
 
    _isPrepared: function() {
      return this.element.retrieve('prototype_element_layout_prepared', false);
    },
 
    _setPrepared: function(bool) {
      return this.element.store('prototype_element_layout_prepared', bool);
    },
 
    toObject: function() {
      var args = $A(arguments);
      var keys = (args.length === 0) ? Element.Layout.PROPERTIES :
       args.join(' ').split(' ');
      var obj = {};
      keys.each( function(key) {
        if (!Element.Layout.PROPERTIES.include(key)) return;
        var value = this.get(key);
        if (value != null) obj[key] = value;
      }, this);
      return obj;
    },
 
    toHash: function() {
      var obj = this.toObject.apply(this, arguments);
      return new Hash(obj);
    },
 
    toCSS: function() {
      var args = $A(arguments);
      var keys = (args.length === 0) ? Element.Layout.PROPERTIES :
       args.join(' ').split(' ');
      var css = {};
 
      keys.each( function(key) {
        if (!Element.Layout.PROPERTIES.include(key)) return;
        if (Element.Layout.COMPOSITE_PROPERTIES.include(key)) return;
 
        var value = this.get(key);
        if (value != null) css[cssNameFor(key)] = value + 'px';
      }, this);
      return css;
    },
 
    inspect: function() {
      return "#<Element.Layout>";
    }
  });
 
  Object.extend(Element.Layout, {
    PROPERTIES: $w('height width top left right bottom border-left border-right border-top border-bottom padding-left padding-right padding-top padding-bottom margin-top margin-bottom margin-left margin-right padding-box-width padding-box-height border-box-width border-box-height margin-box-width margin-box-height'),
 
    COMPOSITE_PROPERTIES: $w('padding-box-width padding-box-height margin-box-width margin-box-height border-box-width border-box-height'),
 
    COMPUTATIONS: {
      'height': function(element) {
        if (!this._preComputing) this._begin();
 
        var bHeight = this.get('border-box-height');
        if (bHeight <= 0) {
          if (!this._preComputing) this._end();
          return 0;
        }
 
        var bTop = this.get('border-top'),
         bBottom = this.get('border-bottom');
 
        var pTop = this.get('padding-top'),
         pBottom = this.get('padding-bottom');
 
        if (!this._preComputing) this._end();
 
        return bHeight - bTop - bBottom - pTop - pBottom;
      },
 
      'width': function(element) {
        if (!this._preComputing) this._begin();
 
        var bWidth = this.get('border-box-width');
        if (bWidth <= 0) {
          if (!this._preComputing) this._end();
          return 0;
        }
 
        var bLeft = this.get('border-left'),
         bRight = this.get('border-right');
 
        var pLeft = this.get('padding-left'),
         pRight = this.get('padding-right');
 
        if (!this._preComputing) this._end();
        return bWidth - bLeft - bRight - pLeft - pRight;
      },
 
      'padding-box-height': function(element) {
        var height = this.get('height'),
         pTop = this.get('padding-top'),
         pBottom = this.get('padding-bottom');
 
        return height + pTop + pBottom;
      },
 
      'padding-box-width': function(element) {
        var width = this.get('width'),
         pLeft = this.get('padding-left'),
         pRight = this.get('padding-right');
 
        return width + pLeft + pRight;
      },
 
      'border-box-height': function(element) {
        if (!this._preComputing) this._begin();
        var height = element.offsetHeight;
        if (!this._preComputing) this._end();
        return height;
      },
 
      'border-box-width': function(element) {
        if (!this._preComputing) this._begin();
        var width = element.offsetWidth;
        if (!this._preComputing) this._end();
        return width;
      },
 
      'margin-box-height': function(element) {
        var bHeight = this.get('border-box-height'),
         mTop = this.get('margin-top'),
         mBottom = this.get('margin-bottom');
 
        if (bHeight <= 0) return 0;
 
        return bHeight + mTop + mBottom;
      },
 
      'margin-box-width': function(element) {
        var bWidth = this.get('border-box-width'),
         mLeft = this.get('margin-left'),
         mRight = this.get('margin-right');
 
        if (bWidth <= 0) return 0;
 
        return bWidth + mLeft + mRight;
      },
 
      'top': function(element) {
        var offset = element.positionedOffset();
        return offset.top;
      },
 
      'bottom': function(element) {
        var offset = element.positionedOffset(),
         parent = element.getOffsetParent(),
         pHeight = parent.measure('height');
 
        var mHeight = this.get('border-box-height');
 
        return pHeight - mHeight - offset.top;
      },
 
      'left': function(element) {
        var offset = element.positionedOffset();
        return offset.left;
      },
 
      'right': function(element) {
        var offset = element.positionedOffset(),
         parent = element.getOffsetParent(),
         pWidth = parent.measure('width');
 
        var mWidth = this.get('border-box-width');
 
        return pWidth - mWidth - offset.left;
      },
 
      'padding-top': function(element) {
        return getPixelValue(element, 'paddingTop');
      },
 
      'padding-bottom': function(element) {
        return getPixelValue(element, 'paddingBottom');
      },
 
      'padding-left': function(element) {
        return getPixelValue(element, 'paddingLeft');
      },
 
      'padding-right': function(element) {
        return getPixelValue(element, 'paddingRight');
      },
 
      'border-top': function(element) {
        return getPixelValue(element, 'borderTopWidth');
      },
 
      'border-bottom': function(element) {
        return getPixelValue(element, 'borderBottomWidth');
      },
 
      'border-left': function(element) {
        return getPixelValue(element, 'borderLeftWidth');
      },
 
      'border-right': function(element) {
        return getPixelValue(element, 'borderRightWidth');
      },
 
      'margin-top': function(element) {
        return getPixelValue(element, 'marginTop');
      },
 
      'margin-bottom': function(element) {
        return getPixelValue(element, 'marginBottom');
      },
 
      'margin-left': function(element) {
        return getPixelValue(element, 'marginLeft');
      },
 
      'margin-right': function(element) {
        return getPixelValue(element, 'marginRight');
      }
    }
  });
 
  if ('getBoundingClientRect' in document.documentElement) {
    Object.extend(Element.Layout.COMPUTATIONS, {
      'right': function(element) {
        var parent = hasLayout(element.getOffsetParent());
        var rect = element.getBoundingClientRect(),
         pRect = parent.getBoundingClientRect();
 
        return (pRect.right - rect.right).round();
      },
 
      'bottom': function(element) {
        var parent = hasLayout(element.getOffsetParent());
        var rect = element.getBoundingClientRect(),
         pRect = parent.getBoundingClientRect();
 
        return (pRect.bottom - rect.bottom).round();
      }
    });
  }
 
  Element.Offset = Class.create({
    initialize: function(left, top) {
      this.left = left.round();
      this.top  = top.round();
 
      this[0] = this.left;
      this[1] = this.top;
    },
 
    relativeTo: function(offset) {
      return new Element.Offset(
        this.left - offset.left,
        this.top  - offset.top
      );
    },
 
    inspect: function() {
      return "#<Element.Offset left: #{left} top: #{top}>".interpolate(this);
    },
 
    toString: function() {
      return "[#{left}, #{top}]".interpolate(this);
    },
 
    toArray: function() {
      return [this.left, this.top];
    }
  });
 
  function getLayout(element, preCompute) {
    return new Element.Layout(element, preCompute);
  }
 
  function measure(element, property) {
    return $(element).getLayout().get(property);
  }
 
  function getHeight(element) {
    return Element.getDimensions(element).height;
  }
 
  function getWidth(element) {
    return Element.getDimensions(element).width;
  }
 
  function getDimensions(element) {
    element = $(element);
    var display = Element.getStyle(element, 'display');
 
    if (display && display !== 'none') {
      return { width: element.offsetWidth, height: element.offsetHeight };
    }
 
    var style = element.style;
    var originalStyles = {
      visibility: style.visibility,
      position:   style.position,
      display:    style.display
    };
 
    var newStyles = {
      visibility: 'hidden',
      display:    'block'
    };
 
    if (originalStyles.position !== 'fixed')
      newStyles.position = 'absolute';
 
    Element.setStyle(element, newStyles);
 
    var dimensions = {
      width:  element.offsetWidth,
      height: element.offsetHeight
    };
 
    Element.setStyle(element, originalStyles);
 
    return dimensions;
  }
 
  function getOffsetParent(element) {
    element = $(element);
 
    if (isDocument(element) || isDetached(element) || isBody(element) || isHtml(element))
      return $(document.body);
 
    var isInline = (Element.getStyle(element, 'display') === 'inline');
    if (!isInline && element.offsetParent) return $(element.offsetParent);
 
    while ((element = element.parentNode) && element !== document.body) {
      if (Element.getStyle(element, 'position') !== 'static') {
        return isHtml(element) ? $(document.body) : $(element);
      }
    }
 
    return $(document.body);
  }
 
 
  function cumulativeOffset(element) {
    element = $(element);
    var valueT = 0, valueL = 0;
    if (element.parentNode) {
      do {
        valueT += element.offsetTop  || 0;
        valueL += element.offsetLeft || 0;
        element = element.offsetParent;
      } while (element);
    }
    return new Element.Offset(valueL, valueT);
  }
 
  function positionedOffset(element) {
    element = $(element);
 
    var layout = element.getLayout();
 
    var valueT = 0, valueL = 0;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;
      element = element.offsetParent;
      if (element) {
        if (isBody(element)) break;
        var p = Element.getStyle(element, 'position');
        if (p !== 'static') break;
      }
    } while (element);
 
    valueL -= layout.get('margin-top');
    valueT -= layout.get('margin-left');
 
    return new Element.Offset(valueL, valueT);
  }
 
  function cumulativeScrollOffset(element) {
    var valueT = 0, valueL = 0;
    do {
      if (element === document.body) {
        var bodyScrollNode = document.documentElement || document.body.parentNode || document.body;
        valueT += !Object.isUndefined(window.pageYOffset) ? window.pageYOffset : bodyScrollNode.scrollTop || 0;
        valueL += !Object.isUndefined(window.pageXOffset) ? window.pageXOffset : bodyScrollNode.scrollLeft || 0;
        break;
      } else {
        valueT += element.scrollTop  || 0;
        valueL += element.scrollLeft || 0;
        element = element.parentNode;
      }
    } while (element);
    return new Element.Offset(valueL, valueT);
  }
 
  function viewportOffset(forElement) {
    var valueT = 0, valueL = 0, docBody = document.body;
 
    forElement = $(forElement);
    var element = forElement;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;
      if (element.offsetParent == docBody &&
        Element.getStyle(element, 'position') == 'absolute') break;
    } while (element = element.offsetParent);
 
    element = forElement;
    do {
      if (element != docBody) {
        valueT -= element.scrollTop  || 0;
        valueL -= element.scrollLeft || 0;
      }
    } while (element = element.parentNode);
    return new Element.Offset(valueL, valueT);
  }
 
  function absolutize(element) {
    element = $(element);
 
    if (Element.getStyle(element, 'position') === 'absolute') {
      return element;
    }
 
    var offsetParent = getOffsetParent(element);
    var eOffset = element.viewportOffset(),
     pOffset = offsetParent.viewportOffset();
 
    var offset = eOffset.relativeTo(pOffset);
    var layout = element.getLayout();
 
    element.store('prototype_absolutize_original_styles', {
      position: element.getStyle('position'),
      left:     element.getStyle('left'),
      top:      element.getStyle('top'),
      width:    element.getStyle('width'),
      height:   element.getStyle('height')
    });
 
    element.setStyle({
      position: 'absolute',
      top:    offset.top + 'px',
      left:   offset.left + 'px',
      width:  layout.get('width') + 'px',
      height: layout.get('height') + 'px'
    });
 
    return element;
  }
 
  function relativize(element) {
    element = $(element);
    if (Element.getStyle(element, 'position') === 'relative') {
      return element;
    }
 
    var originalStyles =
     element.retrieve('prototype_absolutize_original_styles');
 
    if (originalStyles) element.setStyle(originalStyles);
    return element;
  }
 
 
  function scrollTo(element) {
    element = $(element);
    var pos = Element.cumulativeOffset(element);
    window.scrollTo(pos.left, pos.top);
    return element;
  }
 
 
  function makePositioned(element) {
    element = $(element);
    var position = Element.getStyle(element, 'position'), styles = {};
    if (position === 'static' || !position) {
      styles.position = 'relative';
      if (Prototype.Browser.Opera) {
        styles.top  = 0;
        styles.left = 0;
      }
      Element.setStyle(element, styles);
      Element.store(element, 'prototype_made_positioned', true);
    }
    return element;
  }
 
  function undoPositioned(element) {
    element = $(element);
    var storage = Element.getStorage(element),
     madePositioned = storage.get('prototype_made_positioned');
 
    if (madePositioned) {
      storage.unset('prototype_made_positioned');
      Element.setStyle(element, {
        position: '',
        top:      '',
        bottom:   '',
        left:     '',
        right:    ''
      });
    }
    return element;
  }
 
  function makeClipping(element) {
    element = $(element);
 
    var storage = Element.getStorage(element),
     madeClipping = storage.get('prototype_made_clipping');
 
    if (Object.isUndefined(madeClipping)) {
      var overflow = Element.getStyle(element, 'overflow');
      storage.set('prototype_made_clipping', overflow);
      if (overflow !== 'hidden')
        element.style.overflow = 'hidden';
    }
 
    return element;
  }
 
  function undoClipping(element) {
    element = $(element);
    var storage = Element.getStorage(element),
     overflow = storage.get('prototype_made_clipping');
 
    if (!Object.isUndefined(overflow)) {
      storage.unset('prototype_made_clipping');
      element.style.overflow = overflow || '';
    }
 
    return element;
  }
 
  function clonePosition(element, source, options) {
    options = Object.extend({
      setLeft:    true,
      setTop:     true,
      setWidth:   true,
      setHeight:  true,
      offsetTop:  0,
      offsetLeft: 0
    }, options || {});
 
    source  = $(source);
    element = $(element);
    var p, delta, layout, styles = {};
 
    if (options.setLeft || options.setTop) {
      p = Element.viewportOffset(source);
      delta = [0, 0];
      if (Element.getStyle(element, 'position') === 'absolute') {
        var parent = Element.getOffsetParent(element);
        if (parent !== document.body) delta = Element.viewportOffset(parent);
      }
    }
 
    if (options.setWidth || options.setHeight) {
      layout = Element.getLayout(source);
    }
 
    if (options.setLeft)
      styles.left = (p[0] - delta[0] + options.offsetLeft) + 'px';
    if (options.setTop)
      styles.top  = (p[1] - delta[1] + options.offsetTop)  + 'px';
 
    if (options.setWidth)
      styles.width  = layout.get('border-box-width')  + 'px';
    if (options.setHeight)
      styles.height = layout.get('border-box-height') + 'px';
 
    return Element.setStyle(element, styles);
  }
 
 
  if (Prototype.Browser.IE) {
    getOffsetParent = getOffsetParent.wrap(
      function(proceed, element) {
        element = $(element);
 
        if (isDocument(element) || isDetached(element) || isBody(element) || isHtml(element))
          return $(document.body);
 
        var position = element.getStyle('position');
        if (position !== 'static') return proceed(element);
 
        element.setStyle({ position: 'relative' });
        var value = proceed(element);
        element.setStyle({ position: position });
        return value;
      }
    );
 
    positionedOffset = positionedOffset.wrap(function(proceed, element) {
      element = $(element);
      if (!element.parentNode) return new Element.Offset(0, 0);
      var position = element.getStyle('position');
      if (position !== 'static') return proceed(element);
 
      var offsetParent = element.getOffsetParent();
      if (offsetParent && offsetParent.getStyle('position') === 'fixed')
        hasLayout(offsetParent);
 
      element.setStyle({ position: 'relative' });
      var value = proceed(element);
      element.setStyle({ position: position });
      return value;
    });
  } else if (Prototype.Browser.Webkit) {
    cumulativeOffset = function(element) {
      element = $(element);
      var valueT = 0, valueL = 0;
      do {
        valueT += element.offsetTop  || 0;
        valueL += element.offsetLeft || 0;
        if (element.offsetParent == document.body) {
          if (Element.getStyle(element, 'position') == 'absolute') break;
        }
 
        element = element.offsetParent;
      } while (element);
 
      return new Element.Offset(valueL, valueT);
    };
  }
 
 
  Element.addMethods({
    getLayout:              getLayout,
    measure:                measure,
    getWidth:               getWidth,
    getHeight:              getHeight,
    getDimensions:          getDimensions,
    getOffsetParent:        getOffsetParent,
    cumulativeOffset:       cumulativeOffset,
    positionedOffset:       positionedOffset,
    cumulativeScrollOffset: cumulativeScrollOffset,
    viewportOffset:         viewportOffset,
    absolutize:             absolutize,
    relativize:             relativize,
    scrollTo:               scrollTo,
    makePositioned:         makePositioned,
    undoPositioned:         undoPositioned,
    makeClipping:           makeClipping,
    undoClipping:           undoClipping,
    clonePosition:          clonePosition
  });
 
  function isBody(element) {
    return element.nodeName.toUpperCase() === 'BODY';
  }
 
  function isHtml(element) {
    return element.nodeName.toUpperCase() === 'HTML';
  }
 
  function isDocument(element) {
    return element.nodeType === Node.DOCUMENT_NODE;
  }
 
  function isDetached(element) {
    return element !== document.body &&
     !Element.descendantOf(element, document.body);
  }
 
  if ('getBoundingClientRect' in document.documentElement) {
    Element.addMethods({
      viewportOffset: function(element) {
        element = $(element);
        if (isDetached(element)) return new Element.Offset(0, 0);
 
        var rect = element.getBoundingClientRect(),
         docEl = document.documentElement;
        return new Element.Offset(rect.left - docEl.clientLeft,
         rect.top - docEl.clientTop);
      }
    });
  }
 
 
})();
 
(function() {
 
  var IS_OLD_OPERA = Prototype.Browser.Opera &&
   (window.parseFloat(window.opera.version()) < 9.5);
  var ROOT = null;
  function getRootElement() {
    if (ROOT) return ROOT;
    ROOT = IS_OLD_OPERA ? document.body : document.documentElement;
    return ROOT;
  }
 
  function getDimensions() {
    return { width: this.getWidth(), height: this.getHeight() };
  }
 
  function getWidth() {
    return getRootElement().clientWidth;
  }
 
  function getHeight() {
    return getRootElement().clientHeight;
  }
 
  function getScrollOffsets() {
    var x = window.pageXOffset || document.documentElement.scrollLeft ||
     document.body.scrollLeft;
    var y = window.pageYOffset || document.documentElement.scrollTop ||
     document.body.scrollTop;
 
    return new Element.Offset(x, y);
  }
 
  document.viewport = {
    getDimensions:    getDimensions,
    getWidth:         getWidth,
    getHeight:        getHeight,
    getScrollOffsets: getScrollOffsets
  };
 
})();
window.$$ = function() {
  var expression = $A(arguments).join(', ');
  return Prototype.Selector.select(expression, document);
};
 
Prototype.Selector = (function() {
 
  function select() {
    throw new Error('Method "Prototype.Selector.select" must be defined.');
  }
 
  function match() {
    throw new Error('Method "Prototype.Selector.match" must be defined.');
  }
 
  function find(elements, expression, index) {
    index = index || 0;
    var match = Prototype.Selector.match, length = elements.length, matchIndex = 0, i;
 
    for (i = 0; i < length; i++) {
      if (match(elements[i], expression) && index == matchIndex++) {
        return Element.extend(elements[i]);
      }
    }
  }
 
  function extendElements(elements) {
    for (var i = 0, length = elements.length; i < length; i++) {
      Element.extend(elements[i]);
    }
    return elements;
  }
 
 
  var K = Prototype.K;
 
  return {
    select: select,
    match: match,
    find: find,
    extendElements: (Element.extend === K) ? K : extendElements,
    extendElement: Element.extend
  };
})();
Prototype._original_property = window.Sizzle;
/*!
 * Sizzle CSS Selector Engine v@VERSION
 * http://sizzlejs.com/
 *
 * Copyright 2013 jQuery Foundation, Inc. and other contributors
 * Released under the MIT license
 * http://jquery.org/license
 *
 * Date: @DATE
 */
(function( window ) {
 
var i,
        support,
        Expr,
        getText,
        isXML,
        compile,
        select,
        outermostContext,
        sortInput,
        hasDuplicate,
 
        setDocument,
        document,
        docElem,
        documentIsHTML,
        rbuggyQSA,
        rbuggyMatches,
        matches,
        contains,
 
        expando = "sizzle" + -(new Date()),
        preferredDoc = window.document,
        dirruns = 0,
        done = 0,
        classCache = createCache(),
        tokenCache = createCache(),
        compilerCache = createCache(),
        sortOrder = function( a, b ) {
                if ( a === b ) {
                        hasDuplicate = true;
                }
                return 0;
        },
 
        strundefined = typeof undefined,
        MAX_NEGATIVE = 1 << 31,
 
        hasOwn = ({}).hasOwnProperty,
        arr = [],
        pop = arr.pop,
        push_native = arr.push,
        push = arr.push,
        slice = arr.slice,
        indexOf = arr.indexOf || function( elem ) {
                var i = 0,
                        len = this.length;
                for ( ; i < len; i++ ) {
                        if ( this[i] === elem ) {
                                return i;
                        }
                }
                return -1;
        },
 
        booleans = "checked|selected|async|autofocus|autoplay|controls|defer|disabled|hidden|ismap|loop|multiple|open|readonly|required|scoped",
 
 
        whitespace = "[\\x20\\t\\r\\n\\f]",
        characterEncoding = "(?:\\\\.|[\\w-]|[^\\x00-\\xa0])+",
 
        identifier = characterEncoding.replace( "w", "w#" ),
 
        attributes = "\\[" + whitespace + "*(" + characterEncoding + ")" + whitespace +
                "*(?:([*^$|!~]?=)" + whitespace + "*(?:(['\"])((?:\\\\.|[^\\\\])*?)\\3|(" + identifier + ")|)|)" + whitespace + "*\\]",
 
        pseudos = ":(" + characterEncoding + ")(?:\\‍(((['\"])((?:\\\\.|[^\\\\])*?)\\3|((?:\\\\.|[^\\\\‍()[\\]]|" + attributes.replace( 3, 8 ) + ")*)|.*)\\‍)|)",
 
        rtrim = new RegExp( "^" + whitespace + "+|((?:^|[^\\\\])(?:\\\\.)*)" + whitespace + "+$", "g" ),
 
        rcomma = new RegExp( "^" + whitespace + "*," + whitespace + "*" ),
        rcombinators = new RegExp( "^" + whitespace + "*([>+~]|" + whitespace + ")" + whitespace + "*" ),
 
        rattributeQuotes = new RegExp( "=" + whitespace + "*([^\\]'\"]*?)" + whitespace + "*\\]", "g" ),
 
        rpseudo = new RegExp( pseudos ),
        ridentifier = new RegExp( "^" + identifier + "$" ),
 
        matchExpr = {
                "ID": new RegExp( "^#(" + characterEncoding + ")" ),
                "CLASS": new RegExp( "^\\.(" + characterEncoding + ")" ),
                "TAG": new RegExp( "^(" + characterEncoding.replace( "w", "w*" ) + ")" ),
                "ATTR": new RegExp( "^" + attributes ),
                "PSEUDO": new RegExp( "^" + pseudos ),
                "CHILD": new RegExp( "^:(only|first|last|nth|nth-last)-(child|of-type)(?:\\‍(" + whitespace +
                        "*(even|odd|(([+-]|)(\\d*)n|)" + whitespace + "*(?:([+-]|)" + whitespace +
                        "*(\\d+)|))" + whitespace + "*\\‍)|)", "i" ),
                "bool": new RegExp( "^(?:" + booleans + ")$", "i" ),
                "needsContext": new RegExp( "^" + whitespace + "*[>+~]|:(even|odd|eq|gt|lt|nth|first|last)(?:\\‍(" +
                        whitespace + "*((?:-\\d)?\\d*)" + whitespace + "*\\‍)|)(?=[^-]|$)", "i" )
        },
 
        rinputs = /^(?:input|select|textarea|button)$/i,
        rheader = /^h\d$/i,
 
        rnative = /^[^{]+\{\s*\[native \w/,
 
        rquickExpr = /^(?:#([\w-]+)|(\w+)|\.([\w-]+))$/,
 
        rsibling = /[+~]/,
        rescape = /'|\\/g,
 
        runescape = new RegExp( "\\\\‍([\\da-f]{1,6}" + whitespace + "?|(" + whitespace + ")|.)", "ig" ),
        funescape = function( _, escaped, escapedWhitespace ) {
                var high = "0x" + escaped - 0x10000;
                return high !== high || escapedWhitespace ?
                        escaped :
                        high < 0 ?
                                String.fromCharCode( high + 0x10000 ) :
                                String.fromCharCode( high >> 10 | 0xD800, high & 0x3FF | 0xDC00 );
        };
 
try {
        push.apply(
                (arr = slice.call( preferredDoc.childNodes )),
                preferredDoc.childNodes
        );
        arr[ preferredDoc.childNodes.length ].nodeType;
} catch ( e ) {
        push = { apply: arr.length ?
 
                function( target, els ) {
                        push_native.apply( target, slice.call(els) );
                } :
 
                function( target, els ) {
                        var j = target.length,
                                i = 0;
                        while ( (target[j++] = els[i++]) ) {}
                        target.length = j - 1;
                }
        };
}
 
function Sizzle( selector, context, results, seed ) {
        var match, elem, m, nodeType,
                i, groups, old, nid, newContext, newSelector;
 
        if ( ( context ? context.ownerDocument || context : preferredDoc ) !== document ) {
                setDocument( context );
        }
 
        context = context || document;
        results = results || [];
 
        if ( !selector || typeof selector !== "string" ) {
                return results;
        }
 
        if ( (nodeType = context.nodeType) !== 1 && nodeType !== 9 ) {
                return [];
        }
 
        if ( documentIsHTML && !seed ) {
 
                if ( (match = rquickExpr.exec( selector )) ) {
                        if ( (m = match[1]) ) {
                                if ( nodeType === 9 ) {
                                        elem = context.getElementById( m );
                                        if ( elem && elem.parentNode ) {
                                                if ( elem.id === m ) {
                                                        results.push( elem );
                                                        return results;
                                                }
                                        } else {
                                                return results;
                                        }
                                } else {
                                        if ( context.ownerDocument && (elem = context.ownerDocument.getElementById( m )) &&
                                                contains( context, elem ) && elem.id === m ) {
                                                results.push( elem );
                                                return results;
                                        }
                                }
 
                        } else if ( match[2] ) {
                                push.apply( results, context.getElementsByTagName( selector ) );
                                return results;
 
                        } else if ( (m = match[3]) && support.getElementsByClassName && context.getElementsByClassName ) {
                                push.apply( results, context.getElementsByClassName( m ) );
                                return results;
                        }
                }
 
                if ( support.qsa && (!rbuggyQSA || !rbuggyQSA.test( selector )) ) {
                        nid = old = expando;
                        newContext = context;
                        newSelector = nodeType === 9 && selector;
 
                        if ( nodeType === 1 && context.nodeName.toLowerCase() !== "object" ) {
                                groups = tokenize( selector );
 
                                if ( (old = context.getAttribute("id")) ) {
                                        nid = old.replace( rescape, "\\$&" );
                                } else {
                                        context.setAttribute( "id", nid );
                                }
                                nid = "[id='" + nid + "'] ";
 
                                i = groups.length;
                                while ( i-- ) {
                                        groups[i] = nid + toSelector( groups[i] );
                                }
                                newContext = rsibling.test( selector ) && testContext( context.parentNode ) || context;
                                newSelector = groups.join(",");
                        }
 
                        if ( newSelector ) {
                                try {
                                        push.apply( results,
                                                newContext.querySelectorAll( newSelector )
                                        );
                                        return results;
                                } catch(qsaError) {
                                } finally {
                                        if ( !old ) {
                                                context.removeAttribute("id");
                                        }
                                }
                        }
                }
        }
 
        return select( selector.replace( rtrim, "$1" ), context, results, seed );
}
 
/**
 * Create key-value caches of limited size
 * @returns {Function(string, Object)} Returns the Object data after storing it on itself with
 *      property name the (space-suffixed) string and (if the cache is larger than Expr.cacheLength)
 *      deleting the oldest entry
 */
function createCache() {
        var keys = [];
 
        function cache( key, value ) {
                if ( keys.push( key + " " ) > Expr.cacheLength ) {
                        delete cache[ keys.shift() ];
                }
                return (cache[ key + " " ] = value);
        }
        return cache;
}
 
/**
 * Mark a function for special use by Sizzle
 * @param {Function} fn The function to mark
 */
function markFunction( fn ) {
        fn[ expando ] = true;
        return fn;
}
 
/**
 * Support testing using an element
 * @param {Function} fn Passed the created div and expects a boolean result
 */
function assert( fn ) {
        var div = document.createElement("div");
 
        try {
                return !!fn( div );
        } catch (e) {
                return false;
        } finally {
                if ( div.parentNode ) {
                        div.parentNode.removeChild( div );
                }
                div = null;
        }
}
 
/**
 * Adds the same handler for all of the specified attrs
 * @param {String} attrs Pipe-separated list of attributes
 * @param {Function} handler The method that will be applied
 */
function addHandle( attrs, handler ) {
        var arr = attrs.split("|"),
                i = attrs.length;
 
        while ( i-- ) {
                Expr.attrHandle[ arr[i] ] = handler;
        }
}
 
/**
 * Checks document order of two siblings
 * @param {Element} a
 * @param {Element} b
 * @returns {Number} Returns less than 0 if a precedes b, greater than 0 if a follows b
 */
function siblingCheck( a, b ) {
        var cur = b && a,
                diff = cur && a.nodeType === 1 && b.nodeType === 1 &&
                        ( ~b.sourceIndex || MAX_NEGATIVE ) -
                        ( ~a.sourceIndex || MAX_NEGATIVE );
 
        if ( diff ) {
                return diff;
        }
 
        if ( cur ) {
                while ( (cur = cur.nextSibling) ) {
                        if ( cur === b ) {
                                return -1;
                        }
                }
        }
 
        return a ? 1 : -1;
}
 
/**
 * Returns a function to use in pseudos for input types
 * @param {String} type
 */
function createInputPseudo( type ) {
        return function( elem ) {
                var name = elem.nodeName.toLowerCase();
                return name === "input" && elem.type === type;
        };
}
 
/**
 * Returns a function to use in pseudos for buttons
 * @param {String} type
 */
function createButtonPseudo( type ) {
        return function( elem ) {
                var name = elem.nodeName.toLowerCase();
                return (name === "input" || name === "button") && elem.type === type;
        };
}
 
/**
 * Returns a function to use in pseudos for positionals
 * @param {Function} fn
 */
function createPositionalPseudo( fn ) {
        return markFunction(function( argument ) {
                argument = +argument;
                return markFunction(function( seed, matches ) {
                        var j,
                                matchIndexes = fn( [], seed.length, argument ),
                                i = matchIndexes.length;
 
                        while ( i-- ) {
                                if ( seed[ (j = matchIndexes[i]) ] ) {
                                        seed[j] = !(matches[j] = seed[j]);
                                }
                        }
                });
        });
}
 
/**
 * Checks a node for validity as a Sizzle context
 * @param {Element|Object=} context
 * @returns {Element|Object|Boolean} The input node if acceptable, otherwise a falsy value
 */
function testContext( context ) {
        return context && typeof context.getElementsByTagName !== strundefined && context;
}
 
support = Sizzle.support = {};
 
/**
 * Detects XML nodes
 * @param {Element|Object} elem An element or a document
 * @returns {Boolean} True iff elem is a non-HTML XML node
 */
isXML = Sizzle.isXML = function( elem ) {
        var documentElement = elem && (elem.ownerDocument || elem).documentElement;
        return documentElement ? documentElement.nodeName !== "HTML" : false;
};
 
/**
 * Sets document-related variables once based on the current document
 * @param {Element|Object} [doc] An element or document object to use to set the document
 * @returns {Object} Returns the current document
 */
setDocument = Sizzle.setDocument = function( node ) {
        var hasCompare,
                doc = node ? node.ownerDocument || node : preferredDoc,
                parent = doc.defaultView;
 
        if ( doc === document || doc.nodeType !== 9 || !doc.documentElement ) {
                return document;
        }
 
        document = doc;
        docElem = doc.documentElement;
 
        documentIsHTML = !isXML( doc );
 
        if ( parent && parent !== parent.top ) {
                if ( parent.addEventListener ) {
                        parent.addEventListener( "unload", function() {
                                setDocument();
                        }, false );
                } else if ( parent.attachEvent ) {
                        parent.attachEvent( "onunload", function() {
                                setDocument();
                        });
                }
        }
 
        /* Attributes
        ---------------------------------------------------------------------- */
 
        support.attributes = assert(function( div ) {
                div.className = "i";
                return !div.getAttribute("className");
        });
 
        /* getElement(s)By*
        ---------------------------------------------------------------------- */
 
        support.getElementsByTagName = assert(function( div ) {
                div.appendChild( doc.createComment("") );
                return !div.getElementsByTagName("*").length;
        });
 
        support.getElementsByClassName = rnative.test( doc.getElementsByClassName ) && assert(function( div ) {
                div.innerHTML = "<div class='a'></div><div class='a i'></div>";
 
                div.firstChild.className = "i";
                return div.getElementsByClassName("i").length === 2;
        });
 
        support.getById = assert(function( div ) {
                docElem.appendChild( div ).id = expando;
                return !doc.getElementsByName || !doc.getElementsByName( expando ).length;
        });
 
        if ( support.getById ) {
                Expr.find["ID"] = function( id, context ) {
                        if ( typeof context.getElementById !== strundefined && documentIsHTML ) {
                                var m = context.getElementById( id );
                                return m && m.parentNode ? [m] : [];
                        }
                };
                Expr.filter["ID"] = function( id ) {
                        var attrId = id.replace( runescape, funescape );
                        return function( elem ) {
                                return elem.getAttribute("id") === attrId;
                        };
                };
        } else {
                delete Expr.find["ID"];
 
                Expr.filter["ID"] =  function( id ) {
                        var attrId = id.replace( runescape, funescape );
                        return function( elem ) {
                                var node = typeof elem.getAttributeNode !== strundefined && elem.getAttributeNode("id");
                                return node && node.value === attrId;
                        };
                };
        }
 
        Expr.find["TAG"] = support.getElementsByTagName ?
                function( tag, context ) {
                        if ( typeof context.getElementsByTagName !== strundefined ) {
                                return context.getElementsByTagName( tag );
                        }
                } :
                function( tag, context ) {
                        var elem,
                                tmp = [],
                                i = 0,
                                results = context.getElementsByTagName( tag );
 
                        if ( tag === "*" ) {
                                while ( (elem = results[i++]) ) {
                                        if ( elem.nodeType === 1 ) {
                                                tmp.push( elem );
                                        }
                                }
 
                                return tmp;
                        }
                        return results;
                };
 
        Expr.find["CLASS"] = support.getElementsByClassName && function( className, context ) {
                if ( typeof context.getElementsByClassName !== strundefined && documentIsHTML ) {
                        return context.getElementsByClassName( className );
                }
        };
 
        /* QSA/matchesSelector
        ---------------------------------------------------------------------- */
 
 
        rbuggyMatches = [];
 
        rbuggyQSA = [];
 
        if ( (support.qsa = rnative.test( doc.querySelectorAll )) ) {
                assert(function( div ) {
                        div.innerHTML = "<select t=''><option selected=''></option></select>";
 
                        if ( div.querySelectorAll("[t^='']").length ) {
                                rbuggyQSA.push( "[*^$]=" + whitespace + "*(?:''|\"\")" );
                        }
 
                        if ( !div.querySelectorAll("[selected]").length ) {
                                rbuggyQSA.push( "\\[" + whitespace + "*(?:value|" + booleans + ")" );
                        }
 
                        if ( !div.querySelectorAll(":checked").length ) {
                                rbuggyQSA.push(":checked");
                        }
                });
 
                assert(function( div ) {
                        var input = doc.createElement("input");
                        input.setAttribute( "type", "hidden" );
                        div.appendChild( input ).setAttribute( "name", "D" );
 
                        if ( div.querySelectorAll("[name=d]").length ) {
                                rbuggyQSA.push( "name" + whitespace + "*[*^$|!~]?=" );
                        }
 
                        if ( !div.querySelectorAll(":enabled").length ) {
                                rbuggyQSA.push( ":enabled", ":disabled" );
                        }
 
                        div.querySelectorAll("*,:x");
                        rbuggyQSA.push(",.*:");
                });
        }
 
        if ( (support.matchesSelector = rnative.test( (matches = docElem.webkitMatchesSelector ||
                docElem.mozMatchesSelector ||
                docElem.oMatchesSelector ||
                docElem.msMatchesSelector) )) ) {
 
                assert(function( div ) {
                        support.disconnectedMatch = matches.call( div, "div" );
 
                        matches.call( div, "[s!='']:x" );
                        rbuggyMatches.push( "!=", pseudos );
                });
        }
 
        rbuggyQSA = rbuggyQSA.length && new RegExp( rbuggyQSA.join("|") );
        rbuggyMatches = rbuggyMatches.length && new RegExp( rbuggyMatches.join("|") );
 
        /* Contains
        ---------------------------------------------------------------------- */
        hasCompare = rnative.test( docElem.compareDocumentPosition );
 
        contains = hasCompare || rnative.test( docElem.contains ) ?
                function( a, b ) {
                        var adown = a.nodeType === 9 ? a.documentElement : a,
                                bup = b && b.parentNode;
                        return a === bup || !!( bup && bup.nodeType === 1 && (
                                adown.contains ?
                                        adown.contains( bup ) :
                                        a.compareDocumentPosition && a.compareDocumentPosition( bup ) & 16
                        ));
                } :
                function( a, b ) {
                        if ( b ) {
                                while ( (b = b.parentNode) ) {
                                        if ( b === a ) {
                                                return true;
                                        }
                                }
                        }
                        return false;
                };
 
        /* Sorting
        ---------------------------------------------------------------------- */
 
        sortOrder = hasCompare ?
        function( a, b ) {
 
                if ( a === b ) {
                        hasDuplicate = true;
                        return 0;
                }
 
                var compare = !a.compareDocumentPosition - !b.compareDocumentPosition;
                if ( compare ) {
                        return compare;
                }
 
                compare = ( a.ownerDocument || a ) === ( b.ownerDocument || b ) ?
                        a.compareDocumentPosition( b ) :
 
                        1;
 
                if ( compare & 1 ||
                        (!support.sortDetached && b.compareDocumentPosition( a ) === compare) ) {
 
                        if ( a === doc || a.ownerDocument === preferredDoc && contains(preferredDoc, a) ) {
                                return -1;
                        }
                        if ( b === doc || b.ownerDocument === preferredDoc && contains(preferredDoc, b) ) {
                                return 1;
                        }
 
                        return sortInput ?
                                ( indexOf.call( sortInput, a ) - indexOf.call( sortInput, b ) ) :
                                0;
                }
 
                return compare & 4 ? -1 : 1;
        } :
        function( a, b ) {
                if ( a === b ) {
                        hasDuplicate = true;
                        return 0;
                }
 
                var cur,
                        i = 0,
                        aup = a.parentNode,
                        bup = b.parentNode,
                        ap = [ a ],
                        bp = [ b ];
 
                if ( !aup || !bup ) {
                        return a === doc ? -1 :
                                b === doc ? 1 :
                                aup ? -1 :
                                bup ? 1 :
                                sortInput ?
                                ( indexOf.call( sortInput, a ) - indexOf.call( sortInput, b ) ) :
                                0;
 
                } else if ( aup === bup ) {
                        return siblingCheck( a, b );
                }
 
                cur = a;
                while ( (cur = cur.parentNode) ) {
                        ap.unshift( cur );
                }
                cur = b;
                while ( (cur = cur.parentNode) ) {
                        bp.unshift( cur );
                }
 
                while ( ap[i] === bp[i] ) {
                        i++;
                }
 
                return i ?
                        siblingCheck( ap[i], bp[i] ) :
 
                        ap[i] === preferredDoc ? -1 :
                        bp[i] === preferredDoc ? 1 :
                        0;
        };
 
        return doc;
};
 
Sizzle.matches = function( expr, elements ) {
        return Sizzle( expr, null, null, elements );
};
 
Sizzle.matchesSelector = function( elem, expr ) {
        if ( ( elem.ownerDocument || elem ) !== document ) {
                setDocument( elem );
        }
 
        expr = expr.replace( rattributeQuotes, "='$1']" );
 
        if ( support.matchesSelector && documentIsHTML &&
                ( !rbuggyMatches || !rbuggyMatches.test( expr ) ) &&
                ( !rbuggyQSA     || !rbuggyQSA.test( expr ) ) ) {
 
                try {
                        var ret = matches.call( elem, expr );
 
                        if ( ret || support.disconnectedMatch ||
                                        elem.document && elem.document.nodeType !== 11 ) {
                                return ret;
                        }
                } catch(e) {}
        }
 
        return Sizzle( expr, document, null, [elem] ).length > 0;
};
 
Sizzle.contains = function( context, elem ) {
        if ( ( context.ownerDocument || context ) !== document ) {
                setDocument( context );
        }
        return contains( context, elem );
};
 
Sizzle.attr = function( elem, name ) {
        if ( ( elem.ownerDocument || elem ) !== document ) {
                setDocument( elem );
        }
 
        var fn = Expr.attrHandle[ name.toLowerCase() ],
                val = fn && hasOwn.call( Expr.attrHandle, name.toLowerCase() ) ?
                        fn( elem, name, !documentIsHTML ) :
                        undefined;
 
        return val !== undefined ?
                val :
                support.attributes || !documentIsHTML ?
                        elem.getAttribute( name ) :
                        (val = elem.getAttributeNode(name)) && val.specified ?
                                val.value :
                                null;
};
 
Sizzle.error = function( msg ) {
        throw new Error( "Syntax error, unrecognized expression: " + msg );
};
 
/**
 * Document sorting and removing duplicates
 * @param {ArrayLike} results
 */
Sizzle.uniqueSort = function( results ) {
        var elem,
                duplicates = [],
                j = 0,
                i = 0;
 
        hasDuplicate = !support.detectDuplicates;
        sortInput = !support.sortStable && results.slice( 0 );
        results.sort( sortOrder );
 
        if ( hasDuplicate ) {
                while ( (elem = results[i++]) ) {
                        if ( elem === results[ i ] ) {
                                j = duplicates.push( i );
                        }
                }
                while ( j-- ) {
                        results.splice( duplicates[ j ], 1 );
                }
        }
 
        sortInput = null;
 
        return results;
};
 
/**
 * Utility function for retrieving the text value of an array of DOM nodes
 * @param {Array|Element} elem
 */
getText = Sizzle.getText = function( elem ) {
        var node,
                ret = "",
                i = 0,
                nodeType = elem.nodeType;
 
        if ( !nodeType ) {
                while ( (node = elem[i++]) ) {
                        ret += getText( node );
                }
        } else if ( nodeType === 1 || nodeType === 9 || nodeType === 11 ) {
                if ( typeof elem.textContent === "string" ) {
                        return elem.textContent;
                } else {
                        for ( elem = elem.firstChild; elem; elem = elem.nextSibling ) {
                                ret += getText( elem );
                        }
                }
        } else if ( nodeType === 3 || nodeType === 4 ) {
                return elem.nodeValue;
        }
 
        return ret;
};
 
Expr = Sizzle.selectors = {
 
        cacheLength: 50,
 
        createPseudo: markFunction,
 
        match: matchExpr,
 
        attrHandle: {},
 
        find: {},
 
        relative: {
                ">": { dir: "parentNode", first: true },
                " ": { dir: "parentNode" },
                "+": { dir: "previousSibling", first: true },
                "~": { dir: "previousSibling" }
        },
 
        preFilter: {
                "ATTR": function( match ) {
                        match[1] = match[1].replace( runescape, funescape );
 
                        match[3] = ( match[4] || match[5] || "" ).replace( runescape, funescape );
 
                        if ( match[2] === "~=" ) {
                                match[3] = " " + match[3] + " ";
                        }
 
                        return match.slice( 0, 4 );
                },
 
                "CHILD": function( match ) {
                        /* matches from matchExpr["CHILD"]
                                1 type (only|nth|...)
                                2 what (child|of-type)
                                3 argument (even|odd|\d*|\d*n([+-]\d+)?|...)
                                4 xn-component of xn+y argument ([+-]?\d*n|)
                                5 sign of xn-component
                                6 x of xn-component
                                7 sign of y-component
                                8 y of y-component
                        */
                        match[1] = match[1].toLowerCase();
 
                        if ( match[1].slice( 0, 3 ) === "nth" ) {
                                if ( !match[3] ) {
                                        Sizzle.error( match[0] );
                                }
 
                                match[4] = +( match[4] ? match[5] + (match[6] || 1) : 2 * ( match[3] === "even" || match[3] === "odd" ) );
                                match[5] = +( ( match[7] + match[8] ) || match[3] === "odd" );
 
                        } else if ( match[3] ) {
                                Sizzle.error( match[0] );
                        }
 
                        return match;
                },
 
                "PSEUDO": function( match ) {
                        var excess,
                                unquoted = !match[5] && match[2];
 
                        if ( matchExpr["CHILD"].test( match[0] ) ) {
                                return null;
                        }
 
                        if ( match[3] && match[4] !== undefined ) {
                                match[2] = match[4];
 
                        } else if ( unquoted && rpseudo.test( unquoted ) &&
                                (excess = tokenize( unquoted, true )) &&
                                (excess = unquoted.indexOf( ")", unquoted.length - excess ) - unquoted.length) ) {
 
                                match[0] = match[0].slice( 0, excess );
                                match[2] = unquoted.slice( 0, excess );
                        }
 
                        return match.slice( 0, 3 );
                }
        },
 
        filter: {
 
                "TAG": function( nodeNameSelector ) {
                        var nodeName = nodeNameSelector.replace( runescape, funescape ).toLowerCase();
                        return nodeNameSelector === "*" ?
                                function() { return true; } :
                                function( elem ) {
                                        return elem.nodeName && elem.nodeName.toLowerCase() === nodeName;
                                };
                },
 
                "CLASS": function( className ) {
                        var pattern = classCache[ className + " " ];
 
                        return pattern ||
                                (pattern = new RegExp( "(^|" + whitespace + ")" + className + "(" + whitespace + "|$)" )) &&
                                classCache( className, function( elem ) {
                                        return pattern.test( typeof elem.className === "string" && elem.className || typeof elem.getAttribute !== strundefined && elem.getAttribute("class") || "" );
                                });
                },
 
                "ATTR": function( name, operator, check ) {
                        return function( elem ) {
                                var result = Sizzle.attr( elem, name );
 
                                if ( result == null ) {
                                        return operator === "!=";
                                }
                                if ( !operator ) {
                                        return true;
                                }
 
                                result += "";
 
                                return operator === "=" ? result === check :
                                        operator === "!=" ? result !== check :
                                        operator === "^=" ? check && result.indexOf( check ) === 0 :
                                        operator === "*=" ? check && result.indexOf( check ) > -1 :
                                        operator === "$=" ? check && result.slice( -check.length ) === check :
                                        operator === "~=" ? ( " " + result + " " ).indexOf( check ) > -1 :
                                        operator === "|=" ? result === check || result.slice( 0, check.length + 1 ) === check + "-" :
                                        false;
                        };
                },
 
                "CHILD": function( type, what, argument, first, last ) {
                        var simple = type.slice( 0, 3 ) !== "nth",
                                forward = type.slice( -4 ) !== "last",
                                ofType = what === "of-type";
 
                        return first === 1 && last === 0 ?
 
                                function( elem ) {
                                        return !!elem.parentNode;
                                } :
 
                                function( elem, context, xml ) {
                                        var cache, outerCache, node, diff, nodeIndex, start,
                                                dir = simple !== forward ? "nextSibling" : "previousSibling",
                                                parent = elem.parentNode,
                                                name = ofType && elem.nodeName.toLowerCase(),
                                                useCache = !xml && !ofType;
 
                                        if ( parent ) {
 
                                                if ( simple ) {
                                                        while ( dir ) {
                                                                node = elem;
                                                                while ( (node = node[ dir ]) ) {
                                                                        if ( ofType ? node.nodeName.toLowerCase() === name : node.nodeType === 1 ) {
                                                                                return false;
                                                                        }
                                                                }
                                                                start = dir = type === "only" && !start && "nextSibling";
                                                        }
                                                        return true;
                                                }
 
                                                start = [ forward ? parent.firstChild : parent.lastChild ];
 
                                                if ( forward && useCache ) {
                                                        outerCache = parent[ expando ] || (parent[ expando ] = {});
                                                        cache = outerCache[ type ] || [];
                                                        nodeIndex = cache[0] === dirruns && cache[1];
                                                        diff = cache[0] === dirruns && cache[2];
                                                        node = nodeIndex && parent.childNodes[ nodeIndex ];
 
                                                        while ( (node = ++nodeIndex && node && node[ dir ] ||
 
                                                                (diff = nodeIndex = 0) || start.pop()) ) {
 
                                                                if ( node.nodeType === 1 && ++diff && node === elem ) {
                                                                        outerCache[ type ] = [ dirruns, nodeIndex, diff ];
                                                                        break;
                                                                }
                                                        }
 
                                                } else if ( useCache && (cache = (elem[ expando ] || (elem[ expando ] = {}))[ type ]) && cache[0] === dirruns ) {
                                                        diff = cache[1];
 
                                                } else {
                                                        while ( (node = ++nodeIndex && node && node[ dir ] ||
                                                                (diff = nodeIndex = 0) || start.pop()) ) {
 
                                                                if ( ( ofType ? node.nodeName.toLowerCase() === name : node.nodeType === 1 ) && ++diff ) {
                                                                        if ( useCache ) {
                                                                                (node[ expando ] || (node[ expando ] = {}))[ type ] = [ dirruns, diff ];
                                                                        }
 
                                                                        if ( node === elem ) {
                                                                                break;
                                                                        }
                                                                }
                                                        }
                                                }
 
                                                diff -= last;
                                                return diff === first || ( diff % first === 0 && diff / first >= 0 );
                                        }
                                };
                },
 
                "PSEUDO": function( pseudo, argument ) {
                        var args,
                                fn = Expr.pseudos[ pseudo ] || Expr.setFilters[ pseudo.toLowerCase() ] ||
                                        Sizzle.error( "unsupported pseudo: " + pseudo );
 
                        if ( fn[ expando ] ) {
                                return fn( argument );
                        }
 
                        if ( fn.length > 1 ) {
                                args = [ pseudo, pseudo, "", argument ];
                                return Expr.setFilters.hasOwnProperty( pseudo.toLowerCase() ) ?
                                        markFunction(function( seed, matches ) {
                                                var idx,
                                                        matched = fn( seed, argument ),
                                                        i = matched.length;
                                                while ( i-- ) {
                                                        idx = indexOf.call( seed, matched[i] );
                                                        seed[ idx ] = !( matches[ idx ] = matched[i] );
                                                }
                                        }) :
                                        function( elem ) {
                                                return fn( elem, 0, args );
                                        };
                        }
 
                        return fn;
                }
        },
 
        pseudos: {
                "not": markFunction(function( selector ) {
                        var input = [],
                                results = [],
                                matcher = compile( selector.replace( rtrim, "$1" ) );
 
                        return matcher[ expando ] ?
                                markFunction(function( seed, matches, context, xml ) {
                                        var elem,
                                                unmatched = matcher( seed, null, xml, [] ),
                                                i = seed.length;
 
                                        while ( i-- ) {
                                                if ( (elem = unmatched[i]) ) {
                                                        seed[i] = !(matches[i] = elem);
                                                }
                                        }
                                }) :
                                function( elem, context, xml ) {
                                        input[0] = elem;
                                        matcher( input, null, xml, results );
                                        return !results.pop();
                                };
                }),
 
                "has": markFunction(function( selector ) {
                        return function( elem ) {
                                return Sizzle( selector, elem ).length > 0;
                        };
                }),
 
                "contains": markFunction(function( text ) {
                        return function( elem ) {
                                return ( elem.textContent || elem.innerText || getText( elem ) ).indexOf( text ) > -1;
                        };
                }),
 
                "lang": markFunction( function( lang ) {
                        if ( !ridentifier.test(lang || "") ) {
                                Sizzle.error( "unsupported lang: " + lang );
                        }
                        lang = lang.replace( runescape, funescape ).toLowerCase();
                        return function( elem ) {
                                var elemLang;
                                do {
                                        if ( (elemLang = documentIsHTML ?
                                                elem.lang :
                                                elem.getAttribute("xml:lang") || elem.getAttribute("lang")) ) {
 
                                                elemLang = elemLang.toLowerCase();
                                                return elemLang === lang || elemLang.indexOf( lang + "-" ) === 0;
                                        }
                                } while ( (elem = elem.parentNode) && elem.nodeType === 1 );
                                return false;
                        };
                }),
 
                "target": function( elem ) {
                        var hash = window.location && window.location.hash;
                        return hash && hash.slice( 1 ) === elem.id;
                },
 
                "root": function( elem ) {
                        return elem === docElem;
                },
 
                "focus": function( elem ) {
                        return elem === document.activeElement && (!document.hasFocus || document.hasFocus()) && !!(elem.type || elem.href || ~elem.tabIndex);
                },
 
                "enabled": function( elem ) {
                        return elem.disabled === false;
                },
 
                "disabled": function( elem ) {
                        return elem.disabled === true;
                },
 
                "checked": function( elem ) {
                        var nodeName = elem.nodeName.toLowerCase();
                        return (nodeName === "input" && !!elem.checked) || (nodeName === "option" && !!elem.selected);
                },
 
                "selected": function( elem ) {
                        if ( elem.parentNode ) {
                                elem.parentNode.selectedIndex;
                        }
 
                        return elem.selected === true;
                },
 
                "empty": function( elem ) {
                        for ( elem = elem.firstChild; elem; elem = elem.nextSibling ) {
                                if ( elem.nodeType < 6 ) {
                                        return false;
                                }
                        }
                        return true;
                },
 
                "parent": function( elem ) {
                        return !Expr.pseudos["empty"]( elem );
                },
 
                "header": function( elem ) {
                        return rheader.test( elem.nodeName );
                },
 
                "input": function( elem ) {
                        return rinputs.test( elem.nodeName );
                },
 
                "button": function( elem ) {
                        var name = elem.nodeName.toLowerCase();
                        return name === "input" && elem.type === "button" || name === "button";
                },
 
                "text": function( elem ) {
                        var attr;
                        return elem.nodeName.toLowerCase() === "input" &&
                                elem.type === "text" &&
 
                                ( (attr = elem.getAttribute("type")) == null || attr.toLowerCase() === "text" );
                },
 
                "first": createPositionalPseudo(function() {
                        return [ 0 ];
                }),
 
                "last": createPositionalPseudo(function( matchIndexes, length ) {
                        return [ length - 1 ];
                }),
 
                "eq": createPositionalPseudo(function( matchIndexes, length, argument ) {
                        return [ argument < 0 ? argument + length : argument ];
                }),
 
                "even": createPositionalPseudo(function( matchIndexes, length ) {
                        var i = 0;
                        for ( ; i < length; i += 2 ) {
                                matchIndexes.push( i );
                        }
                        return matchIndexes;
                }),
 
                "odd": createPositionalPseudo(function( matchIndexes, length ) {
                        var i = 1;
                        for ( ; i < length; i += 2 ) {
                                matchIndexes.push( i );
                        }
                        return matchIndexes;
                }),
 
                "lt": createPositionalPseudo(function( matchIndexes, length, argument ) {
                        var i = argument < 0 ? argument + length : argument;
                        for ( ; --i >= 0; ) {
                                matchIndexes.push( i );
                        }
                        return matchIndexes;
                }),
 
                "gt": createPositionalPseudo(function( matchIndexes, length, argument ) {
                        var i = argument < 0 ? argument + length : argument;
                        for ( ; ++i < length; ) {
                                matchIndexes.push( i );
                        }
                        return matchIndexes;
                })
        }
};
 
Expr.pseudos["nth"] = Expr.pseudos["eq"];
 
for ( i in { radio: true, checkbox: true, file: true, password: true, image: true } ) {
        Expr.pseudos[ i ] = createInputPseudo( i );
}
for ( i in { submit: true, reset: true } ) {
        Expr.pseudos[ i ] = createButtonPseudo( i );
}
 
function setFilters() {}
setFilters.prototype = Expr.filters = Expr.pseudos;
Expr.setFilters = new setFilters();
 
function tokenize( selector, parseOnly ) {
        var matched, match, tokens, type,
                soFar, groups, preFilters,
                cached = tokenCache[ selector + " " ];
 
        if ( cached ) {
                return parseOnly ? 0 : cached.slice( 0 );
        }
 
        soFar = selector;
        groups = [];
        preFilters = Expr.preFilter;
 
        while ( soFar ) {
 
                if ( !matched || (match = rcomma.exec( soFar )) ) {
                        if ( match ) {
                                soFar = soFar.slice( match[0].length ) || soFar;
                        }
                        groups.push( (tokens = []) );
                }
 
                matched = false;
 
                if ( (match = rcombinators.exec( soFar )) ) {
                        matched = match.shift();
                        tokens.push({
                                value: matched,
                                type: match[0].replace( rtrim, " " )
                        });
                        soFar = soFar.slice( matched.length );
                }
 
                for ( type in Expr.filter ) {
                        if ( (match = matchExpr[ type ].exec( soFar )) && (!preFilters[ type ] ||
                                (match = preFilters[ type ]( match ))) ) {
                                matched = match.shift();
                                tokens.push({
                                        value: matched,
                                        type: type,
                                        matches: match
                                });
                                soFar = soFar.slice( matched.length );
                        }
                }
 
                if ( !matched ) {
                        break;
                }
        }
 
        return parseOnly ?
                soFar.length :
                soFar ?
                        Sizzle.error( selector ) :
                        tokenCache( selector, groups ).slice( 0 );
}
 
function toSelector( tokens ) {
        var i = 0,
                len = tokens.length,
                selector = "";
        for ( ; i < len; i++ ) {
                selector += tokens[i].value;
        }
        return selector;
}
 
function addCombinator( matcher, combinator, base ) {
        var dir = combinator.dir,
                checkNonElements = base && dir === "parentNode",
                doneName = done++;
 
        return combinator.first ?
                function( elem, context, xml ) {
                        while ( (elem = elem[ dir ]) ) {
                                if ( elem.nodeType === 1 || checkNonElements ) {
                                        return matcher( elem, context, xml );
                                }
                        }
                } :
 
                function( elem, context, xml ) {
                        var oldCache, outerCache,
                                newCache = [ dirruns, doneName ];
 
                        if ( xml ) {
                                while ( (elem = elem[ dir ]) ) {
                                        if ( elem.nodeType === 1 || checkNonElements ) {
                                                if ( matcher( elem, context, xml ) ) {
                                                        return true;
                                                }
                                        }
                                }
                        } else {
                                while ( (elem = elem[ dir ]) ) {
                                        if ( elem.nodeType === 1 || checkNonElements ) {
                                                outerCache = elem[ expando ] || (elem[ expando ] = {});
                                                if ( (oldCache = outerCache[ dir ]) &&
                                                        oldCache[ 0 ] === dirruns && oldCache[ 1 ] === doneName ) {
 
                                                        return (newCache[ 2 ] = oldCache[ 2 ]);
                                                } else {
                                                        outerCache[ dir ] = newCache;
 
                                                        if ( (newCache[ 2 ] = matcher( elem, context, xml )) ) {
                                                                return true;
                                                        }
                                                }
                                        }
                                }
                        }
                };
}
 
function elementMatcher( matchers ) {
        return matchers.length > 1 ?
                function( elem, context, xml ) {
                        var i = matchers.length;
                        while ( i-- ) {
                                if ( !matchers[i]( elem, context, xml ) ) {
                                        return false;
                                }
                        }
                        return true;
                } :
                matchers[0];
}
 
function multipleContexts( selector, contexts, results ) {
        var i = 0,
                len = contexts.length;
        for ( ; i < len; i++ ) {
                Sizzle( selector, contexts[i], results );
        }
        return results;
}
 
function condense( unmatched, map, filter, context, xml ) {
        var elem,
                newUnmatched = [],
                i = 0,
                len = unmatched.length,
                mapped = map != null;
 
        for ( ; i < len; i++ ) {
                if ( (elem = unmatched[i]) ) {
                        if ( !filter || filter( elem, context, xml ) ) {
                                newUnmatched.push( elem );
                                if ( mapped ) {
                                        map.push( i );
                                }
                        }
                }
        }
 
        return newUnmatched;
}
 
function setMatcher( preFilter, selector, matcher, postFilter, postFinder, postSelector ) {
        if ( postFilter && !postFilter[ expando ] ) {
                postFilter = setMatcher( postFilter );
        }
        if ( postFinder && !postFinder[ expando ] ) {
                postFinder = setMatcher( postFinder, postSelector );
        }
        return markFunction(function( seed, results, context, xml ) {
                var temp, i, elem,
                        preMap = [],
                        postMap = [],
                        preexisting = results.length,
 
                        elems = seed || multipleContexts( selector || "*", context.nodeType ? [ context ] : context, [] ),
 
                        matcherIn = preFilter && ( seed || !selector ) ?
                                condense( elems, preMap, preFilter, context, xml ) :
                                elems,
 
                        matcherOut = matcher ?
                                postFinder || ( seed ? preFilter : preexisting || postFilter ) ?
 
                                        [] :
 
                                        results :
                                matcherIn;
 
                if ( matcher ) {
                        matcher( matcherIn, matcherOut, context, xml );
                }
 
                if ( postFilter ) {
                        temp = condense( matcherOut, postMap );
                        postFilter( temp, [], context, xml );
 
                        i = temp.length;
                        while ( i-- ) {
                                if ( (elem = temp[i]) ) {
                                        matcherOut[ postMap[i] ] = !(matcherIn[ postMap[i] ] = elem);
                                }
                        }
                }
 
                if ( seed ) {
                        if ( postFinder || preFilter ) {
                                if ( postFinder ) {
                                        temp = [];
                                        i = matcherOut.length;
                                        while ( i-- ) {
                                                if ( (elem = matcherOut[i]) ) {
                                                        temp.push( (matcherIn[i] = elem) );
                                                }
                                        }
                                        postFinder( null, (matcherOut = []), temp, xml );
                                }
 
                                i = matcherOut.length;
                                while ( i-- ) {
                                        if ( (elem = matcherOut[i]) &&
                                                (temp = postFinder ? indexOf.call( seed, elem ) : preMap[i]) > -1 ) {
 
                                                seed[temp] = !(results[temp] = elem);
                                        }
                                }
                        }
 
                } else {
                        matcherOut = condense(
                                matcherOut === results ?
                                        matcherOut.splice( preexisting, matcherOut.length ) :
                                        matcherOut
                        );
                        if ( postFinder ) {
                                postFinder( null, results, matcherOut, xml );
                        } else {
                                push.apply( results, matcherOut );
                        }
                }
        });
}
 
function matcherFromTokens( tokens ) {
        var checkContext, matcher, j,
                len = tokens.length,
                leadingRelative = Expr.relative[ tokens[0].type ],
                implicitRelative = leadingRelative || Expr.relative[" "],
                i = leadingRelative ? 1 : 0,
 
                matchContext = addCombinator( function( elem ) {
                        return elem === checkContext;
                }, implicitRelative, true ),
                matchAnyContext = addCombinator( function( elem ) {
                        return indexOf.call( checkContext, elem ) > -1;
                }, implicitRelative, true ),
                matchers = [ function( elem, context, xml ) {
                        return ( !leadingRelative && ( xml || context !== outermostContext ) ) || (
                                (checkContext = context).nodeType ?
                                        matchContext( elem, context, xml ) :
                                        matchAnyContext( elem, context, xml ) );
                } ];
 
        for ( ; i < len; i++ ) {
                if ( (matcher = Expr.relative[ tokens[i].type ]) ) {
                        matchers = [ addCombinator(elementMatcher( matchers ), matcher) ];
                } else {
                        matcher = Expr.filter[ tokens[i].type ].apply( null, tokens[i].matches );
 
                        if ( matcher[ expando ] ) {
                                j = ++i;
                                for ( ; j < len; j++ ) {
                                        if ( Expr.relative[ tokens[j].type ] ) {
                                                break;
                                        }
                                }
                                return setMatcher(
                                        i > 1 && elementMatcher( matchers ),
                                        i > 1 && toSelector(
                                                tokens.slice( 0, i - 1 ).concat({ value: tokens[ i - 2 ].type === " " ? "*" : "" })
                                        ).replace( rtrim, "$1" ),
                                        matcher,
                                        i < j && matcherFromTokens( tokens.slice( i, j ) ),
                                        j < len && matcherFromTokens( (tokens = tokens.slice( j )) ),
                                        j < len && toSelector( tokens )
                                );
                        }
                        matchers.push( matcher );
                }
        }
 
        return elementMatcher( matchers );
}
 
function matcherFromGroupMatchers( elementMatchers, setMatchers ) {
        var bySet = setMatchers.length > 0,
                byElement = elementMatchers.length > 0,
                superMatcher = function( seed, context, xml, results, outermost ) {
                        var elem, j, matcher,
                                matchedCount = 0,
                                i = "0",
                                unmatched = seed && [],
                                setMatched = [],
                                contextBackup = outermostContext,
                                elems = seed || byElement && Expr.find["TAG"]( "*", outermost ),
                                dirrunsUnique = (dirruns += contextBackup == null ? 1 : Math.random() || 0.1),
                                len = elems.length;
 
                        if ( outermost ) {
                                outermostContext = context !== document && context;
                        }
 
                        for ( ; i !== len && (elem = elems[i]) != null; i++ ) {
                                if ( byElement && elem ) {
                                        j = 0;
                                        while ( (matcher = elementMatchers[j++]) ) {
                                                if ( matcher( elem, context, xml ) ) {
                                                        results.push( elem );
                                                        break;
                                                }
                                        }
                                        if ( outermost ) {
                                                dirruns = dirrunsUnique;
                                        }
                                }
 
                                if ( bySet ) {
                                        if ( (elem = !matcher && elem) ) {
                                                matchedCount--;
                                        }
 
                                        if ( seed ) {
                                                unmatched.push( elem );
                                        }
                                }
                        }
 
                        matchedCount += i;
                        if ( bySet && i !== matchedCount ) {
                                j = 0;
                                while ( (matcher = setMatchers[j++]) ) {
                                        matcher( unmatched, setMatched, context, xml );
                                }
 
                                if ( seed ) {
                                        if ( matchedCount > 0 ) {
                                                while ( i-- ) {
                                                        if ( !(unmatched[i] || setMatched[i]) ) {
                                                                setMatched[i] = pop.call( results );
                                                        }
                                                }
                                        }
 
                                        setMatched = condense( setMatched );
                                }
 
                                push.apply( results, setMatched );
 
                                if ( outermost && !seed && setMatched.length > 0 &&
                                        ( matchedCount + setMatchers.length ) > 1 ) {
 
                                        Sizzle.uniqueSort( results );
                                }
                        }
 
                        if ( outermost ) {
                                dirruns = dirrunsUnique;
                                outermostContext = contextBackup;
                        }
 
                        return unmatched;
                };
 
        return bySet ?
                markFunction( superMatcher ) :
                superMatcher;
}
 
compile = Sizzle.compile = function( selector, match /* Internal Use Only */ ) {
        var i,
                setMatchers = [],
                elementMatchers = [],
                cached = compilerCache[ selector + " " ];
 
        if ( !cached ) {
                if ( !match ) {
                        match = tokenize( selector );
                }
                i = match.length;
                while ( i-- ) {
                        cached = matcherFromTokens( match[i] );
                        if ( cached[ expando ] ) {
                                setMatchers.push( cached );
                        } else {
                                elementMatchers.push( cached );
                        }
                }
 
                cached = compilerCache( selector, matcherFromGroupMatchers( elementMatchers, setMatchers ) );
 
                cached.selector = selector;
        }
        return cached;
};
 
/**
 * A low-level selection function that works with Sizzle's compiled
 *  selector functions
 * @param {String|Function} selector A selector or a pre-compiled
 *  selector function built with Sizzle.compile
 * @param {Element} context
 * @param {Array} [results]
 * @param {Array} [seed] A set of elements to match against
 */
select = Sizzle.select = function( selector, context, results, seed ) {
        var i, tokens, token, type, find,
                compiled = typeof selector === "function" && selector,
                match = !seed && tokenize( (selector = compiled.selector || selector) );
 
        results = results || [];
 
        if ( match.length === 1 ) {
 
                tokens = match[0] = match[0].slice( 0 );
                if ( tokens.length > 2 && (token = tokens[0]).type === "ID" &&
                                support.getById && context.nodeType === 9 && documentIsHTML &&
                                Expr.relative[ tokens[1].type ] ) {
 
                        context = ( Expr.find["ID"]( token.matches[0].replace(runescape, funescape), context ) || [] )[0];
                        if ( !context ) {
                                return results;
 
                        } else if ( compiled ) {
                                context = context.parentNode;
                        }
 
                        selector = selector.slice( tokens.shift().value.length );
                }
 
                i = matchExpr["needsContext"].test( selector ) ? 0 : tokens.length;
                while ( i-- ) {
                        token = tokens[i];
 
                        if ( Expr.relative[ (type = token.type) ] ) {
                                break;
                        }
                        if ( (find = Expr.find[ type ]) ) {
                                if ( (seed = find(
                                        token.matches[0].replace( runescape, funescape ),
                                        rsibling.test( tokens[0].type ) && testContext( context.parentNode ) || context
                                )) ) {
 
                                        tokens.splice( i, 1 );
                                        selector = seed.length && toSelector( tokens );
                                        if ( !selector ) {
                                                push.apply( results, seed );
                                                return results;
                                        }
 
                                        break;
                                }
                        }
                }
        }
 
        ( compiled || compile( selector, match ) )(
                seed,
                context,
                !documentIsHTML,
                results,
                rsibling.test( selector ) && testContext( context.parentNode ) || context
        );
        return results;
};
 
 
support.sortStable = expando.split("").sort( sortOrder ).join("") === expando;
 
support.detectDuplicates = !!hasDuplicate;
 
setDocument();
 
support.sortDetached = assert(function( div1 ) {
        return div1.compareDocumentPosition( document.createElement("div") ) & 1;
});
 
if ( !assert(function( div ) {
        div.innerHTML = "<a href='#'></a>";
        return div.firstChild.getAttribute("href") === "#" ;
}) ) {
        addHandle( "type|href|height|width", function( elem, name, isXML ) {
                if ( !isXML ) {
                        return elem.getAttribute( name, name.toLowerCase() === "type" ? 1 : 2 );
                }
        });
}
 
if ( !support.attributes || !assert(function( div ) {
        div.innerHTML = "<input/>";
        div.firstChild.setAttribute( "value", "" );
        return div.firstChild.getAttribute( "value" ) === "";
}) ) {
        addHandle( "value", function( elem, name, isXML ) {
                if ( !isXML && elem.nodeName.toLowerCase() === "input" ) {
                        return elem.defaultValue;
                }
        });
}
 
if ( !assert(function( div ) {
        return div.getAttribute("disabled") == null;
}) ) {
        addHandle( booleans, function( elem, name, isXML ) {
                var val;
                if ( !isXML ) {
                        return elem[ name ] === true ? name.toLowerCase() :
                                        (val = elem.getAttributeNode( name )) && val.specified ?
                                        val.value :
                                null;
                }
        });
}
 
if ( typeof define === "function" && define.amd ) {
        define(function() { return Sizzle; });
} else if ( typeof module !== "undefined" && module.exports ) {
        module.exports = Sizzle;
} else {
        window.Sizzle = Sizzle;
}
 
})( window );
 
;(function(engine) {
  var extendElements = Prototype.Selector.extendElements;
 
  function select(selector, scope) {
    return extendElements(engine(selector, scope || document));
  }
 
  function match(element, selector) {
    return engine.matches(selector, [element]).length == 1;
  }
 
  Prototype.Selector.engine = engine;
  Prototype.Selector.select = select;
  Prototype.Selector.match = match;
})(Sizzle);
 
window.Sizzle = Prototype._original_property;
delete Prototype._original_property;
 
var Form = {
  reset: function(form) {
    form = $(form);
    form.reset();
    return form;
  },
 
  serializeElements: function(elements, options) {
    if (typeof options != 'object') options = { hash: !!options };
    else if (Object.isUndefined(options.hash)) options.hash = true;
    var key, value, submitted = false, submit = options.submit, accumulator, initial;
 
    if (options.hash) {
      initial = {};
      accumulator = function(result, key, value) {
        if (key in result) {
          if (!Object.isArray(result[key])) result[key] = [result[key]];
          result[key] = result[key].concat(value);
        } else result[key] = value;
        return result;
      };
    } else {
      initial = '';
      accumulator = function(result, key, values) {
        if (!Object.isArray(values)) {values = [values];}
        if (!values.length) {return result;}
        var encodedKey = encodeURIComponent(key).gsub(/%20/, '+');
        return result + (result ? "&" : "") + values.map(function (value) {
          value = value.gsub(/(\r)?\n/, '\r\n');
          value = encodeURIComponent(value);
          value = value.gsub(/%20/, '+');
          return encodedKey + "=" + value;
        }).join("&");
      };
    }
 
    return elements.inject(initial, function(result, element) {
      if (!element.disabled && element.name) {
        key = element.name; value = $(element).getValue();
        if (value != null && element.type != 'file' && (element.type != 'submit' || (!submitted &&
            submit !== false && (!submit || key == submit) && (submitted = true)))) {
          result = accumulator(result, key, value);
        }
      }
      return result;
    });
  }
};
 
Form.Methods = {
  serialize: function(form, options) {
    return Form.serializeElements(Form.getElements(form), options);
  },
 
 
  getElements: function(form) {
    var elements = $(form).getElementsByTagName('*');
    var element, results = [], serializers = Form.Element.Serializers;
 
    for (var i = 0; element = elements[i]; i++) {
      if (serializers[element.tagName.toLowerCase()])
        results.push(Element.extend(element));
    }
    return results;
  },
 
  getInputs: function(form, typeName, name) {
    form = $(form);
    var inputs = form.getElementsByTagName('input');
 
    if (!typeName && !name) return $A(inputs).map(Element.extend);
 
    for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
      var input = inputs[i];
      if ((typeName && input.type != typeName) || (name && input.name != name))
        continue;
      matchingInputs.push(Element.extend(input));
    }
 
    return matchingInputs;
  },
 
  disable: function(form) {
    form = $(form);
    Form.getElements(form).invoke('disable');
    return form;
  },
 
  enable: function(form) {
    form = $(form);
    Form.getElements(form).invoke('enable');
    return form;
  },
 
  findFirstElement: function(form) {
    var elements = $(form).getElements().findAll(function(element) {
      return 'hidden' != element.type && !element.disabled;
    });
    var firstByIndex = elements.findAll(function(element) {
      return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
    }).sortBy(function(element) { return element.tabIndex }).first();
 
    return firstByIndex ? firstByIndex : elements.find(function(element) {
      return /^(?:input|select|textarea)$/i.test(element.tagName);
    });
  },
 
  focusFirstElement: function(form) {
    form = $(form);
    var element = form.findFirstElement();
    if (element) element.activate();
    return form;
  },
 
  request: function(form, options) {
    form = $(form), options = Object.clone(options || { });
 
    var params = options.parameters, action = form.readAttribute('action') || '';
    if (action.blank()) action = window.location.href;
    options.parameters = form.serialize(true);
 
    if (params) {
      if (Object.isString(params)) params = params.toQueryParams();
      Object.extend(options.parameters, params);
    }
 
    if (form.hasAttribute('method') && !options.method)
      options.method = form.method;
 
    return new Ajax.Request(action, options);
  }
};
 
/*--------------------------------------------------------------------------*/
 
 
Form.Element = {
  focus: function(element) {
    $(element).focus();
    return element;
  },
 
  select: function(element) {
    $(element).select();
    return element;
  }
};
 
Form.Element.Methods = {
 
  serialize: function(element) {
    element = $(element);
    if (!element.disabled && element.name) {
      var value = element.getValue();
      if (value != undefined) {
        var pair = { };
        pair[element.name] = value;
        return Object.toQueryString(pair);
      }
    }
    return '';
  },
 
  getValue: function(element) {
    element = $(element);
    var method = element.tagName.toLowerCase();
    return Form.Element.Serializers[method](element);
  },
 
  setValue: function(element, value) {
    element = $(element);
    var method = element.tagName.toLowerCase();
    Form.Element.Serializers[method](element, value);
    return element;
  },
 
  clear: function(element) {
    $(element).value = '';
    return element;
  },
 
  present: function(element) {
    return $(element).value != '';
  },
 
  activate: function(element) {
    element = $(element);
    try {
      element.focus();
      if (element.select && (element.tagName.toLowerCase() != 'input' ||
          !(/^(?:button|reset|submit)$/i.test(element.type))))
        element.select();
    } catch (e) { }
    return element;
  },
 
  disable: function(element) {
    element = $(element);
    element.disabled = true;
    return element;
  },
 
  enable: function(element) {
    element = $(element);
    element.disabled = false;
    return element;
  }
};
 
/*--------------------------------------------------------------------------*/
 
var Field = Form.Element;
 
var $F = Form.Element.Methods.getValue;
 
/*--------------------------------------------------------------------------*/
 
Form.Element.Serializers = (function() {
  function input(element, value) {
    switch (element.type.toLowerCase()) {
      case 'checkbox':
      case 'radio':
        return inputSelector(element, value);
      default:
        return valueSelector(element, value);
    }
  }
 
  function inputSelector(element, value) {
    if (Object.isUndefined(value))
      return element.checked ? element.value : null;
    else element.checked = !!value;
  }
 
  function valueSelector(element, value) {
    if (Object.isUndefined(value)) return element.value;
    else element.value = value;
  }
 
  function select(element, value) {
    if (Object.isUndefined(value))
      return (element.type === 'select-one' ? selectOne : selectMany)(element);
 
    var opt, currentValue, single = !Object.isArray(value);
    for (var i = 0, length = element.length; i < length; i++) {
      opt = element.options[i];
      currentValue = this.optionValue(opt);
      if (single) {
        if (currentValue == value) {
          opt.selected = true;
          return;
        }
      }
      else opt.selected = value.include(currentValue);
    }
  }
 
  function selectOne(element) {
    var index = element.selectedIndex;
    return index >= 0 ? optionValue(element.options[index]) : null;
  }
 
  function selectMany(element) {
    var values, length = element.length;
    if (!length) return null;
 
    for (var i = 0, values = []; i < length; i++) {
      var opt = element.options[i];
      if (opt.selected) values.push(optionValue(opt));
    }
    return values;
  }
 
  function optionValue(opt) {
    return Element.hasAttribute(opt, 'value') ? opt.value : opt.text;
  }
 
  return {
    input:         input,
    inputSelector: inputSelector,
    textarea:      valueSelector,
    select:        select,
    selectOne:     selectOne,
    selectMany:    selectMany,
    optionValue:   optionValue,
    button:        valueSelector
  };
})();
 
/*--------------------------------------------------------------------------*/
 
 
Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
  initialize: function($super, element, frequency, callback) {
    $super(callback, frequency);
    this.element   = $(element);
    this.lastValue = this.getValue();
  },
 
  execute: function() {
    var value = this.getValue();
    if (Object.isString(this.lastValue) && Object.isString(value) ?
        this.lastValue != value : String(this.lastValue) != String(value)) {
      this.callback(this.element, value);
      this.lastValue = value;
    }
  }
});
 
Form.Element.Observer = Class.create(Abstract.TimedObserver, {
  getValue: function() {
    return Form.Element.getValue(this.element);
  }
});
 
Form.Observer = Class.create(Abstract.TimedObserver, {
  getValue: function() {
    return Form.serialize(this.element);
  }
});
 
/*--------------------------------------------------------------------------*/
 
Abstract.EventObserver = Class.create({
  initialize: function(element, callback) {
    this.element  = $(element);
    this.callback = callback;
 
    this.lastValue = this.getValue();
    if (this.element.tagName.toLowerCase() == 'form')
      this.registerFormCallbacks();
    else
      this.registerCallback(this.element);
  },
 
  onElementEvent: function() {
    var value = this.getValue();
    if (this.lastValue != value) {
      this.callback(this.element, value);
      this.lastValue = value;
    }
  },
 
  registerFormCallbacks: function() {
    Form.getElements(this.element).each(this.registerCallback, this);
  },
 
  registerCallback: function(element) {
    if (element.type) {
      switch (element.type.toLowerCase()) {
        case 'checkbox':
        case 'radio':
          Event.observe(element, 'click', this.onElementEvent.bind(this));
          break;
        default:
          Event.observe(element, 'change', this.onElementEvent.bind(this));
          break;
      }
    }
  }
});
 
Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
  getValue: function() {
    return Form.Element.getValue(this.element);
  }
});
 
Form.EventObserver = Class.create(Abstract.EventObserver, {
  getValue: function() {
    return Form.serialize(this.element);
  }
});
(function(GLOBAL) {
  var DIV = document.createElement('div');
  var docEl = document.documentElement;
  var MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED = 'onmouseenter' in docEl
   && 'onmouseleave' in docEl;
 
  var Event = {
    KEY_BACKSPACE: 8,
    KEY_TAB:       9,
    KEY_RETURN:   13,
    KEY_ESC:      27,
    KEY_LEFT:     37,
    KEY_UP:       38,
    KEY_RIGHT:    39,
    KEY_DOWN:     40,
    KEY_DELETE:   46,
    KEY_HOME:     36,
    KEY_END:      35,
    KEY_PAGEUP:   33,
    KEY_PAGEDOWN: 34,
    KEY_INSERT:   45
  };
 
 
  var isIELegacyEvent = function(event) { return false; };
 
  if (window.attachEvent) {
    if (window.addEventListener) {
      isIELegacyEvent = function(event) {
        return !(event instanceof window.Event);
      };
    } else {
      isIELegacyEvent = function(event) { return true; };
    }
  }
 
  var _isButton;
 
  function _isButtonForDOMEvents(event, code) {
    return event.which ? (event.which === code + 1) : (event.button === code);
  }
 
  var legacyButtonMap = { 0: 1, 1: 4, 2: 2 };
  function _isButtonForLegacyEvents(event, code) {
    return event.button === legacyButtonMap[code];
  }
 
  function _isButtonForWebKit(event, code) {
    switch (code) {
      case 0: return event.which == 1 && !event.metaKey;
      case 1: return event.which == 2 || (event.which == 1 && event.metaKey);
      case 2: return event.which == 3;
      default: return false;
    }
  }
 
  if (window.attachEvent) {
    if (!window.addEventListener) {
      _isButton = _isButtonForLegacyEvents;
    } else {
      _isButton = function(event, code) {
        return isIELegacyEvent(event) ? _isButtonForLegacyEvents(event, code) :
         _isButtonForDOMEvents(event, code);
      }
    }
  } else if (Prototype.Browser.WebKit) {
    _isButton = _isButtonForWebKit;
  } else {
    _isButton = _isButtonForDOMEvents;
  }
 
  function isLeftClick(event)   { return _isButton(event, 0) }
 
  function isMiddleClick(event) { return _isButton(event, 1) }
 
  function isRightClick(event)  { return _isButton(event, 2) }
 
  function element(event) {
    return Element.extend(_element(event));
  }
 
  function _element(event) {
    event = Event.extend(event);
 
    var node = event.target, type = event.type,
     currentTarget = event.currentTarget;
 
    if (currentTarget && currentTarget.tagName) {
      if (type === 'load' || type === 'error' ||
        (type === 'click' && currentTarget.tagName.toLowerCase() === 'input'
          && currentTarget.type === 'radio'))
            node = currentTarget;
    }
 
    return node.nodeType == Node.TEXT_NODE ? node.parentNode : node;
  }
 
  function findElement(event, expression) {
    var element = _element(event), selector = Prototype.Selector;
    if (!expression) return Element.extend(element);
    while (element) {
      if (Object.isElement(element) && selector.match(element, expression))
        return Element.extend(element);
      element = element.parentNode;
    }
  }
 
  function pointer(event) {
    return { x: pointerX(event), y: pointerY(event) };
  }
 
  function pointerX(event) {
    var docElement = document.documentElement,
     body = document.body || { scrollLeft: 0 };
 
    return event.pageX || (event.clientX +
      (docElement.scrollLeft || body.scrollLeft) -
      (docElement.clientLeft || 0));
  }
 
  function pointerY(event) {
    var docElement = document.documentElement,
     body = document.body || { scrollTop: 0 };
 
    return  event.pageY || (event.clientY +
       (docElement.scrollTop || body.scrollTop) -
       (docElement.clientTop || 0));
  }
 
 
  function stop(event) {
    Event.extend(event);
    event.preventDefault();
    event.stopPropagation();
 
    event.stopped = true;
  }
 
 
  Event.Methods = {
    isLeftClick:   isLeftClick,
    isMiddleClick: isMiddleClick,
    isRightClick:  isRightClick,
 
    element:     element,
    findElement: findElement,
 
    pointer:  pointer,
    pointerX: pointerX,
    pointerY: pointerY,
 
    stop: stop
  };
 
  var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
    m[name] = Event.Methods[name].methodize();
    return m;
  });
 
  if (window.attachEvent) {
    function _relatedTarget(event) {
      var element;
      switch (event.type) {
        case 'mouseover':
        case 'mouseenter':
          element = event.fromElement;
          break;
        case 'mouseout':
        case 'mouseleave':
          element = event.toElement;
          break;
        default:
          return null;
      }
      return Element.extend(element);
    }
 
    var additionalMethods = {
      stopPropagation: function() { this.cancelBubble = true },
      preventDefault:  function() { this.returnValue = false },
      inspect: function() { return '[object Event]' }
    };
 
    Event.extend = function(event, element) {
      if (!event) return false;
 
      if (!isIELegacyEvent(event)) return event;
 
      if (event._extendedByPrototype) return event;
      event._extendedByPrototype = Prototype.emptyFunction;
 
      var pointer = Event.pointer(event);
 
      Object.extend(event, {
        target: event.srcElement || element,
        relatedTarget: _relatedTarget(event),
        pageX:  pointer.x,
        pageY:  pointer.y
      });
 
      Object.extend(event, methods);
      Object.extend(event, additionalMethods);
 
      return event;
    };
  } else {
    Event.extend = Prototype.K;
  }
 
  if (window.addEventListener) {
    Event.prototype = window.Event.prototype || document.createEvent('HTMLEvents').__proto__;
    Object.extend(Event.prototype, methods);
  }
 
  var EVENT_TRANSLATIONS = {
    mouseenter: 'mouseover',
    mouseleave: 'mouseout'
  };
 
  function getDOMEventName(eventName) {
    return EVENT_TRANSLATIONS[eventName] || eventName;
  }
 
  if (MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED)
    getDOMEventName = Prototype.K;
 
  function getUniqueElementID(element) {
    if (element === window) return 0;
 
    if (typeof element._prototypeUID === 'undefined')
      element._prototypeUID = Element.Storage.UID++;
    return element._prototypeUID;
  }
 
  function getUniqueElementID_IE(element) {
    if (element === window) return 0;
    if (element == document) return 1;
    return element.uniqueID;
  }
 
  if ('uniqueID' in DIV)
    getUniqueElementID = getUniqueElementID_IE;
 
  function isCustomEvent(eventName) {
    return eventName.include(':');
  }
 
  Event._isCustomEvent = isCustomEvent;
 
  function getRegistryForElement(element, uid) {
    var CACHE = GLOBAL.Event.cache;
    if (Object.isUndefined(uid))
      uid = getUniqueElementID(element);
    if (!CACHE[uid]) CACHE[uid] = { element: element };
    return CACHE[uid];
  }
 
  function destroyRegistryForElement(element, uid) {
    if (Object.isUndefined(uid))
      uid = getUniqueElementID(element);
    delete GLOBAL.Event.cache[uid];
  }
 
 
  function register(element, eventName, handler) {
    var registry = getRegistryForElement(element);
    if (!registry[eventName]) registry[eventName] = [];
    var entries = registry[eventName];
 
    var i = entries.length;
    while (i--)
      if (entries[i].handler === handler) return null;
 
    var uid = getUniqueElementID(element);
    var responder = GLOBAL.Event._createResponder(uid, eventName, handler);
    var entry = {
      responder: responder,
      handler:   handler
    };
 
    entries.push(entry);
    return entry;
  }
 
  function unregister(element, eventName, handler) {
    var registry = getRegistryForElement(element);
    var entries = registry[eventName];
    if (!entries) return;
 
    var i = entries.length, entry;
    while (i--) {
      if (entries[i].handler === handler) {
        entry = entries[i];
        break;
      }
    }
 
    if (!entry) return;
 
    var index = entries.indexOf(entry);
    entries.splice(index, 1);
 
    return entry;
  }
 
 
  function observe(element, eventName, handler) {
    element = $(element);
    var entry = register(element, eventName, handler);
 
    if (entry === null) return element;
 
    var responder = entry.responder;
    if (isCustomEvent(eventName))
      observeCustomEvent(element, eventName, responder);
    else
      observeStandardEvent(element, eventName, responder);
 
    return element;
  }
 
  function observeStandardEvent(element, eventName, responder) {
    var actualEventName = getDOMEventName(eventName);
    if (element.addEventListener) {
      element.addEventListener(actualEventName, responder, false);
    } else {
      element.attachEvent('on' + actualEventName, responder);
    }
  }
 
  function observeCustomEvent(element, eventName, responder) {
    if (element.addEventListener) {
      element.addEventListener('dataavailable', responder, false);
    } else {
      element.attachEvent('ondataavailable', responder);
      element.attachEvent('onlosecapture',   responder);
    }
  }
 
  function stopObserving(element, eventName, handler) {
    element = $(element);
    var handlerGiven = !Object.isUndefined(handler),
     eventNameGiven = !Object.isUndefined(eventName);
 
    if (!eventNameGiven && !handlerGiven) {
      stopObservingElement(element);
      return element;
    }
 
    if (!handlerGiven) {
      stopObservingEventName(element, eventName);
      return element;
    }
 
    var entry = unregister(element, eventName, handler);
 
    if (!entry) return element;
    removeEvent(element, eventName, entry.responder);
    return element;
  }
 
  function stopObservingStandardEvent(element, eventName, responder) {
    var actualEventName = getDOMEventName(eventName);
    if (element.removeEventListener) {
      element.removeEventListener(actualEventName, responder, false);
    } else {
      element.detachEvent('on' + actualEventName, responder);
    }
  }
 
  function stopObservingCustomEvent(element, eventName, responder) {
    if (element.removeEventListener) {
      element.removeEventListener('dataavailable', responder, false);
    } else {
      element.detachEvent('ondataavailable', responder);
      element.detachEvent('onlosecapture',   responder);
    }
  }
 
 
 
  function stopObservingElement(element) {
    var uid = getUniqueElementID(element), registry = GLOBAL.Event.cache[uid];
    if (!registry) return;
 
    destroyRegistryForElement(element, uid);
 
    var entries, i;
    for (var eventName in registry) {
      if (eventName === 'element') continue;
 
      entries = registry[eventName];
      i = entries.length;
      while (i--)
        removeEvent(element, eventName, entries[i].responder);
    }
  }
 
  function stopObservingEventName(element, eventName) {
    var registry = getRegistryForElement(element);
    var entries = registry[eventName];
    if (!entries) return;
    delete registry[eventName];
 
    var i = entries.length;
    while (i--)
      removeEvent(element, eventName, entries[i].responder);
  }
 
 
  function removeEvent(element, eventName, handler) {
    if (isCustomEvent(eventName))
      stopObservingCustomEvent(element, eventName, handler);
    else
      stopObservingStandardEvent(element, eventName, handler);
  }
 
 
 
  function getFireTarget(element) {
    if (element !== document) return element;
    if (document.createEvent && !element.dispatchEvent)
      return document.documentElement;
    return element;
  }
 
  function fire(element, eventName, memo, bubble) {
    element = getFireTarget($(element));
    if (Object.isUndefined(bubble)) bubble = true;
    memo = memo || {};
 
    var event = fireEvent(element, eventName, memo, bubble);
    return Event.extend(event);
  }
 
  function fireEvent_DOM(element, eventName, memo, bubble) {
    var event = document.createEvent('HTMLEvents');
    event.initEvent('dataavailable', bubble, true);
 
    event.eventName = eventName;
    event.memo = memo;
 
    element.dispatchEvent(event);
    return event;
  }
 
  function fireEvent_IE(element, eventName, memo, bubble) {
    var event = document.createEventObject();
    event.eventType = bubble ? 'ondataavailable' : 'onlosecapture';
 
    event.eventName = eventName;
    event.memo = memo;
 
    element.fireEvent(event.eventType, event);
    return event;
  }
 
  var fireEvent = document.createEvent ? fireEvent_DOM : fireEvent_IE;
 
 
 
  Event.Handler = Class.create({
    initialize: function(element, eventName, selector, callback) {
      this.element   = $(element);
      this.eventName = eventName;
      this.selector  = selector;
      this.callback  = callback;
      this.handler   = this.handleEvent.bind(this);
    },
 
 
    start: function() {
      Event.observe(this.element, this.eventName, this.handler);
      return this;
    },
 
    stop: function() {
      Event.stopObserving(this.element, this.eventName, this.handler);
      return this;
    },
 
    handleEvent: function(event) {
      var element = Event.findElement(event, this.selector);
      if (element) this.callback.call(this.element, event, element);
    }
  });
 
  function on(element, eventName, selector, callback) {
    element = $(element);
    if (Object.isFunction(selector) && Object.isUndefined(callback)) {
      callback = selector, selector = null;
    }
 
    return new Event.Handler(element, eventName, selector, callback).start();
  }
 
  Object.extend(Event, Event.Methods);
 
  Object.extend(Event, {
    fire:          fire,
    observe:       observe,
    stopObserving: stopObserving,
    on:            on
  });
 
  Element.addMethods({
    fire:          fire,
 
    observe:       observe,
 
    stopObserving: stopObserving,
 
    on:            on
  });
 
  Object.extend(document, {
    fire:          fire.methodize(),
 
    observe:       observe.methodize(),
 
    stopObserving: stopObserving.methodize(),
 
    on:            on.methodize(),
 
    loaded:        false
  });
 
  if (GLOBAL.Event) Object.extend(window.Event, Event);
  else GLOBAL.Event = Event;
 
  GLOBAL.Event.cache = {};
 
  function destroyCache_IE() {
    GLOBAL.Event.cache = null;
  }
 
  if (window.attachEvent)
    window.attachEvent('onunload', destroyCache_IE);
 
  DIV = null;
  docEl = null;
})(this);
 
(function(GLOBAL) {
  /* Code for creating leak-free event responders is based on work by
   John-David Dalton. */
 
  var docEl = document.documentElement;
  var MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED = 'onmouseenter' in docEl
    && 'onmouseleave' in docEl;
 
  function isSimulatedMouseEnterLeaveEvent(eventName) {
    return !MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED &&
     (eventName === 'mouseenter' || eventName === 'mouseleave');
  }
 
  function createResponder(uid, eventName, handler) {
    if (Event._isCustomEvent(eventName))
      return createResponderForCustomEvent(uid, eventName, handler);
    if (isSimulatedMouseEnterLeaveEvent(eventName))
      return createMouseEnterLeaveResponder(uid, eventName, handler);
 
    return function(event) {
      if (!Event.cache) return;
 
      var element = Event.cache[uid].element;
      Event.extend(event, element);
      handler.call(element, event);
    };
  }
 
  function createResponderForCustomEvent(uid, eventName, handler) {
    return function(event) {
      var element = Event.cache[uid].element;
 
      if (Object.isUndefined(event.eventName))
        return false;
 
      if (event.eventName !== eventName)
        return false;
 
      Event.extend(event, element);
      handler.call(element, event);
    };
  }
 
  function createMouseEnterLeaveResponder(uid, eventName, handler) {
    return function(event) {
      var element = Event.cache[uid].element;
 
      Event.extend(event, element);
      var parent = event.relatedTarget;
 
      while (parent && parent !== element) {
        try { parent = parent.parentNode; }
        catch(e) { parent = element; }
      }
 
      if (parent === element) return;
      handler.call(element, event);
    }
  }
 
  GLOBAL.Event._createResponder = createResponder;
  docEl = null;
})(this);
 
(function(GLOBAL) {
  /* Support for the DOMContentLoaded event is based on work by Dan Webb,
     Matthias Miller, Dean Edwards, John Resig, and Diego Perini. */
 
  var TIMER;
 
  function fireContentLoadedEvent() {
    if (document.loaded) return;
    if (TIMER) window.clearTimeout(TIMER);
    document.loaded = true;
    document.fire('dom:loaded');
  }
 
  function checkReadyState() {
    if (document.readyState === 'complete') {
      document.detachEvent('onreadystatechange', checkReadyState);
      fireContentLoadedEvent();
    }
  }
 
  function pollDoScroll() {
    try {
      document.documentElement.doScroll('left');
    } catch (e) {
      TIMER = pollDoScroll.defer();
      return;
    }
 
    fireContentLoadedEvent();
  }
 
 
  if (document.readyState === 'complete') {
    fireContentLoadedEvent();
    return;
  }
 
  if (document.addEventListener) {
    document.addEventListener('DOMContentLoaded', fireContentLoadedEvent, false);
  } else {
    document.attachEvent('onreadystatechange', checkReadyState);
    if (window == top) TIMER = pollDoScroll.defer();
  }
 
  Event.observe(window, 'load', fireContentLoadedEvent);
})(this);
 
 
Element.addMethods();
/*------------------------------- DEPRECATED -------------------------------*/
 
Hash.toQueryString = Object.toQueryString;
 
var Toggle = { display: Element.toggle };
 
Element.Methods.childOf = Element.Methods.descendantOf;
 
var Insertion = {
  Before: function(element, content) {
    return Element.insert(element, {before:content});
  },
 
  Top: function(element, content) {
    return Element.insert(element, {top:content});
  },
 
  Bottom: function(element, content) {
    return Element.insert(element, {bottom:content});
  },
 
  After: function(element, content) {
    return Element.insert(element, {after:content});
  }
};
 
var $continue = new Error('"throw $continue" is deprecated, use "return" instead');
 
var Position = {
  includeScrollOffsets: false,
 
  prepare: function() {
    this.deltaX =  window.pageXOffset
                || document.documentElement.scrollLeft
                || document.body.scrollLeft
                || 0;
    this.deltaY =  window.pageYOffset
                || document.documentElement.scrollTop
                || document.body.scrollTop
                || 0;
  },
 
  within: function(element, x, y) {
    if (this.includeScrollOffsets)
      return this.withinIncludingScrolloffsets(element, x, y);
    this.xcomp = x;
    this.ycomp = y;
    this.offset = Element.cumulativeOffset(element);
 
    return (y >= this.offset[1] &&
            y <  this.offset[1] + element.offsetHeight &&
            x >= this.offset[0] &&
            x <  this.offset[0] + element.offsetWidth);
  },
 
  withinIncludingScrolloffsets: function(element, x, y) {
    var offsetcache = Element.cumulativeScrollOffset(element);
 
    this.xcomp = x + offsetcache[0] - this.deltaX;
    this.ycomp = y + offsetcache[1] - this.deltaY;
    this.offset = Element.cumulativeOffset(element);
 
    return (this.ycomp >= this.offset[1] &&
            this.ycomp <  this.offset[1] + element.offsetHeight &&
            this.xcomp >= this.offset[0] &&
            this.xcomp <  this.offset[0] + element.offsetWidth);
  },
 
  overlap: function(mode, element) {
    if (!mode) return 0;
    if (mode == 'vertical')
      return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
        element.offsetHeight;
    if (mode == 'horizontal')
      return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
        element.offsetWidth;
  },
 
 
  cumulativeOffset: Element.Methods.cumulativeOffset,
 
  positionedOffset: Element.Methods.positionedOffset,
 
  absolutize: function(element) {
    Position.prepare();
    return Element.absolutize(element);
  },
 
  relativize: function(element) {
    Position.prepare();
    return Element.relativize(element);
  },
 
  realOffset: Element.Methods.cumulativeScrollOffset,
 
  offsetParent: Element.Methods.getOffsetParent,
 
  page: Element.Methods.viewportOffset,
 
  clone: function(source, target, options) {
    options = options || { };
    return Element.clonePosition(target, source, options);
  }
};
 
/*--------------------------------------------------------------------------*/
 
if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods){
  function iter(name) {
    return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
  }
 
  instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
  function(element, className) {
    className = className.toString().strip();
    var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
    return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
  } : function(element, className) {
    className = className.toString().strip();
    var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
    if (!classNames && !className) return elements;
 
    var nodes = $(element).getElementsByTagName('*');
    className = ' ' + className + ' ';
 
    for (var i = 0, child, cn; child = nodes[i]; i++) {
      if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
          (classNames && classNames.all(function(name) {
            return !name.toString().blank() && cn.include(' ' + name + ' ');
          }))))
        elements.push(Element.extend(child));
    }
    return elements;
  };
 
  return function(className, parentElement) {
    return $(parentElement || document.body).getElementsByClassName(className);
  };
}(Element.Methods);
 
/*--------------------------------------------------------------------------*/
 
Element.ClassNames = Class.create();
Element.ClassNames.prototype = {
  initialize: function(element) {
    this.element = $(element);
  },
 
  _each: function(iterator, context) {
    this.element.className.split(/\s+/).select(function(name) {
      return name.length > 0;
    })._each(iterator, context);
  },
 
  set: function(className) {
    this.element.className = className;
  },
 
  add: function(classNameToAdd) {
    if (this.include(classNameToAdd)) return;
    this.set($A(this).concat(classNameToAdd).join(' '));
  },
 
  remove: function(classNameToRemove) {
    if (!this.include(classNameToRemove)) return;
    this.set($A(this).without(classNameToRemove).join(' '));
  },
 
  toString: function() {
    return $A(this).join(' ');
  }
};
 
Object.extend(Element.ClassNames.prototype, Enumerable);
 
/*--------------------------------------------------------------------------*/
 
(function() {
  window.Selector = Class.create({
    initialize: function(expression) {
      this.expression = expression.strip();
    },
 
    findElements: function(rootElement) {
      return Prototype.Selector.select(this.expression, rootElement);
    },
 
    match: function(element) {
      return Prototype.Selector.match(element, this.expression);
    },
 
    toString: function() {
      return this.expression;
    },
 
    inspect: function() {
      return "#<Selector: " + this.expression + ">";
    }
  });
 
  Object.extend(Selector, {
    matchElements: function(elements, expression) {
      var match = Prototype.Selector.match,
          results = [];
 
      for (var i = 0, length = elements.length; i < length; i++) {
        var element = elements[i];
        if (match(element, expression)) {
          results.push(Element.extend(element));
        }
      }
      return results;
    },
 
    findElement: function(elements, expression, index) {
      index = index || 0;
      var matchIndex = 0, element;
      for (var i = 0, length = elements.length; i < length; i++) {
        element = elements[i];
        if (Prototype.Selector.match(element, expression) && index === matchIndex++) {
          return Element.extend(element);
        }
      }
    },
 
    findChildElements: function(element, expressions) {
      var selector = expressions.toArray().join(', ');
      return Prototype.Selector.select(selector, element || document);
    }
  });
})();