/*  Prototype JavaScript framework, version 1.6.0.2
   *  (c) 2005-2008 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: '1.6.0.2',
  
    Browser: {
      IE:     !!(window.attachEvent && !window.opera),
      Opera:  !!window.opera,
      WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
      Gecko:  navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1,
      MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
    },
  
    BrowserFeatures: {
      XPath: !!document.evaluate,
      ElementExtensions: !!window.HTMLElement,
      SpecificElementExtensions:
        document.createElement('div').__proto__ &&
        document.createElement('div').__proto__ !==
          document.createElement('form').__proto__
    },
  
    ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
    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 = {
    create: function() {
      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) {
        var subclass = function() { };
        subclass.prototype = parent.prototype;
        klass.prototype = new subclass;
        parent.subclasses.push(klass);
      }
  
      for (var i = 0; i < properties.length; i++)
        klass.addMethods(properties[i]);
  
      if (!klass.prototype.initialize)
        klass.prototype.initialize = Prototype.emptyFunction;
  
      klass.prototype.constructor = klass;
  
      return klass;
    }
  };
  
  Class.Methods = {
    addMethods: function(source) {
      var ancestor   = this.superclass && this.superclass.prototype;
      var properties = Object.keys(source);
  
      if (!Object.keys({ toString: true }).length)
        properties.push("toString", "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().first() == "$super")\; \{\; var\; method\; =\; value,\; value\; =\; Object.extend((function(m)\; \{\; return\; function()\; \{\; return\; ancestor[m].apply(this,\; arguments)$};
          })(property).wrap(method), {
            valueOf:  function() { return method },
            toString: function() { return method.toString() }
          });
        }
        this.prototype[property] = value;
      }
  
      return this;
    }
  };
  
  var Abstract = { };
  
  Object.extend = function(destination, source) {
    for (var property in source)
      destination[property] = source[property];
    return destination;
  };
  
  Object.extend(Object, {
    inspect: function(object) {
      try {
        if (Object.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;
      }
    },
  
    toJSON: function(object) {
      var type = typeof object;
      switch (type) {
        case 'undefined':
        case 'function':
        case 'unknown': return;
        case 'boolean': return object.toString();
      }
  
      if (object === null) return 'null';
      if (object.toJSON) return object.toJSON();
      if (Object.isElement(object)) return;
  
      var results = [];
      for (var property in object) {
        var value = Object.toJSON(object[property]);
        if (!Object.isUndefined(value))
          results.push(property.toJSON() + ': ' + value);
      }
  
      return '{' + results.join(', ') + '}';
    },
  
    toQueryString: function(object) {
      return H(object).toQueryString();
    },
  
    toHTML: function(object) {
      return object && object.toHTML ? object.toHTML() : String.interpret(object);
    },
  
    keys: function(object) {
      var keys = [];
      for (var property in object)
        keys.push(property);
      return keys;
    },
  
    values: function(object) {
      var values = [];
      for (var property in object)
        values.push(object[property]);
      return values;
    },
  
    clone: function(object) {
      return Object.extend({ }, object);
    },
  
    isElement: function(object) {
      return object && object.nodeType == 1;
    },
  
    isArray: function(object) {
      return object != null && typeof object == "object" &&
        'splice' in object && 'join' in object;
    },
  
    isHash: function(object) {
      return object instanceof Hash;
    },
  
    isFunction: function(object) {
      return typeof object == "function";
    },
  
    isString: function(object) {
      return typeof object == "string";
    },
  
    isNumber: function(object) {
      return typeof object == "number";
    },
  
    isUndefined: function(object) {
      return typeof object == "undefined";
    }
  });
  
  Object.extend(Function.prototype, {
    argumentNames: function() {
      var names = this.toString().match(/^[\s\(]*function[^(]*\((.*?)\)/)[1].split(",").invoke("strip");
      return names.length == 1 && !names[0] ? [] : names;
    },
  
    bind: function() {
      if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
      var __method = this, args = $A(arguments),\; object\; =\; args.shift();\; return\; function()\; \{\; return\; \_\_method.apply(object,\; args.concat($A(arguments)));
      }
    },
  
    bindAsEventListener: function() {
      var __method = this, args = $A(arguments),\; object\; =\; args.shift();\; return\; function(event)\; \{\; return\; \_\_method.apply(object,\; [event\; ||\; window.event].concat(args));\; \}\; \},\; curry:\; function()\; \{\; if\; (!arguments.length)\; return\; this;\; var\; \_\_method\; =\; this,\; args\; =$A(arguments);
      return function() {
        return __method.apply(this, args.concat($A(arguments)));\; \}\; \},\; delay:\; function()\; \{\; var\; \_\_method\; =\; this,\; args\; =$A(arguments), timeout = args.shift() * 1000;
      return window.setTimeout(function() {
        return __method.apply(__method, args);
      }, timeout);
    },
  
    wrap: function(wrapper) {
      var __method = this;
      return function() {
        return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));\; \}\; \},\; methodize:\; function()\; \{\; if\; (this.\_methodized)\; return\; this.\_methodized;\; var\; \_\_method\; =\; this;\; return\; this.\_methodized\; =\; function()\; \{\; return\; \_\_method.apply(null,\; [this].concat($A(arguments)));
      };
    }
  });
  
  Function.prototype.defer = Function.prototype.delay.curry(0.01);
  
  Date.prototype.toJSON = function() {
    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"';
  };
  
  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;
    }
  };
  
  RegExp.prototype.match = RegExp.prototype.test;
  
  RegExp.escape = function(str) {
    return String(str).replace(/([.*+?^=!:$\{\}()|[\backslash ]\backslash /\backslash \backslash ])/g,\; \text{'}\backslash \$1\text{'});$};
  
  /*--------------------------------------------------------------------------*/
  
  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();
        } finally {
          this.currentlyExecuting = false;
        }
      }
    }
  });
  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, {
    gsub: function(pattern, replacement) {
      var result = '', source = this, match;
      replacement = arguments.callee.prepareReplacement(replacement);
  
      while (source.length > 0) {
        if (match = source.match(pattern)) {
          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;
    },
  
    sub: function(pattern, replacement, count) {
      replacement = this.gsub.prepareReplacement(replacement);
      count = Object.isUndefined(count) ? 1 : count;
  
      return this.gsub(pattern, function(match) {
        if (--count < 0) return match[0];
        return replacement(match);
      });
    },
  
    scan: function(pattern, iterator) {
      this.gsub(pattern, iterator);
      return String(this);
    },
  
    truncate: function(length, truncation) {
      length = length || 30;
      truncation = Object.isUndefined(truncation) ? '...' : truncation;
      return this.length > length ?
        this.slice(0, length - truncation.length) + truncation : String(this);
    },
  
    strip: function() {
      return this.replace(/^\s+/, '').replace(/\s+/, '');
    },
  
    stripTags: function() {
      return this.replace(/<\/?[^>]+>/gi, '');
    },
  
    stripScripts: function() {
      return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
    },
  
    extractScripts: function() {
      var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
      var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
      return (this.match(matchAll) || []).map(function(scriptTag) {
        return (scriptTag.match(matchOne) || ['', ''])[1];
      });
    },
  
    evalScripts: function() {
      return this.extractScripts().map(function(script) { return eval(script) });
    },
  
    escapeHTML: function() {
      var self = arguments.callee;
      self.text.data = this;
      return self.div.innerHTML;
    },
  
    unescapeHTML: function() {
      var div = new Element('div');
      div.innerHTML = this.stripTags();
      return div.childNodes[0] ? (div.childNodes.length > 1 ?
        $A(div.childNodes).inject(\text{'}\text{'},\; function(memo,\; node)\; \{\; return\; memo+node.nodeValue\; \})\; :\; div.childNodes[0].nodeValue)\; :\; \text{'}\text{'};\; \},\; toQueryParams:\; function(separator)\; \{\; var\; match\; =\; this.strip().match(/([^?\#]*)(\#.*)?$/);
      if (!match) return { };
  
      return match[1].split(separator || '&').inject({ }, function(hash, pair) {
        if ((pair = pair.split('='))[0]) {
          var key = decodeURIComponent(pair.shift());
          var value = pair.length > 1 ? pair.join('=') : pair[0];
          if (value != undefined) 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;
      });
    },
  
    toArray: function() {
      return this.split('');
    },
  
    succ: function() {
      return this.slice(0, this.length - 1) +
        String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
    },
  
    times: function(count) {
      return count < 1 ? '' : new Array(count + 1).join(this);
    },
  
    camelize: function() {
      var parts = this.split('-'), len = parts.length;
      if (len == 1) return parts[0];
  
      var camelized = this.charAt(0) == '-'
        ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
        : parts[0];
  
      for (var i = 1; i < len; i++)
        camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);
  
      return camelized;
    },
  
    capitalize: function() {
      return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
    },
  
    underscore: function() {
      return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
    },
  
    dasherize: function() {
      return this.gsub(/_/,'-');
    },
  
    inspect: function(useDoubleQuotes) {
      var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
        var character = String.specialChar[match[0]];
        return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
      });
      if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
      return "'" + escapedString.replace(/'/g, '\\\'') + "'";
    },
  
    toJSON: function() {
      return this.inspect(true);
    },
  
    unfilterJSON: function(filter) {
      return this.sub(filter || Prototype.JSONFilter, '#{1}');
    },
  
    isJSON: function() {
      var str = this;
      if (str.blank()) return false;
      str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
      return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*/.test(this);
    },
  
    interpolate: function(object, pattern) {
      return new Template(this, pattern).evaluate(object);
    }
  });
  
  if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
    escapeHTML: function() {
      return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
    },
    unescapeHTML: function() {
      return this.replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
    }
  });
  
  String.prototype.gsub.prepareReplacement = function(replacement) {
    if (Object.isFunction(replacement)) return replacement;
    var template = new Template(replacement);
    return function(match) { return template.evaluate(match) };
  };
  
  String.prototype.parseQuery = String.prototype.toQueryParams;
  
  Object.extend(String.prototype.escapeHTML, {
    div:  document.createElement('div'),
    text: document.createTextNode('')
  });
  
  with (String.prototype.escapeHTML) div.appendChild(text);
  
  var Template = Class.create({
    initialize: function(template, pattern) {
      this.template = template.toString();
      this.pattern = pattern || Template.Pattern;
    },
  
    evaluate: function(object) {
      if (Object.isFunction(object.toTemplateReplacements))
        object = object.toTemplateReplacements();
  
      return this.template.gsub(this.pattern, function(match) {
        if (object == null) return '';
  
        var before = match[1] || '';
        if (before == '\\') return match[2];
  
        var ctx = object, expr = match[3];
        var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;\; match\; =\; pattern.exec(expr);\; if\; (match\; ==\; null)\; return\; before;\; while\; (match\; !=\; null)\; \{\; var\; comp\; =\; match[1].startsWith(\text{'}[\text{'})\; ?\; match[2].gsub(\text{'}\backslash \backslash \backslash \backslash ]\text{'},\; \text{'}]\text{'})\; :\; match[1];\; ctx\; =\; ctx[comp];\; if\; (null\; ==\; ctx\; ||\; \text{'}\text{'}\; ==\; match[3])\; break;\; expr\; =\; expr.substring(\text{'}[\text{'}\; ==\; match[3]\; ?\; match[1].length\; :\; match[0].length);\; match\; =\; pattern.exec(expr);\; \}\; return\; before\; +\; String.interpret(ctx);\; \});\; \}\; \});\; Template.Pattern\; =\; /(^|.|\backslash r|\backslash n)(\#\{(.*?)\})/;\; var$break = { };
  
  var Enumerable = {
    each: function(iterator, context) {
      var index = 0;
      iterator = iterator.bind(context);
      try {
        this._each(function(value) {
          iterator(value, index++);
        });
      } catch (e) {
        if (e != break;
      });
      return result;
    },
  
    any: function(iterator, context) {
      iterator = iterator ? iterator.bind(context) : Prototype.K;
      var result = false;
      this.each(function(value, index) {
        if (result = !!iterator(value, index))
          throw $break;\; \});\; return\; result;\; \},\; collect:\; function(iterator,\; context)\; \{\; iterator\; =\; iterator\; ?\; iterator.bind(context)\; :\; Prototype.K;\; var\; results\; =\; [];\; this.each(function(value,\; index)\; \{\; results.push(iterator(value,\; index));\; \});\; return\; results;\; \},\; detect:\; function(iterator,\; context)\; \{\; iterator\; =\; iterator.bind(context);\; var\; result;\; this.each(function(value,\; index)\; \{\; if\; (iterator(value,\; index))\; \{\; result\; =\; value;\; throw$break;
        }
      });
      return result;
    },
  
    findAll: function(iterator, context) {
      iterator = iterator.bind(context);
      var results = [];
      this.each(function(value, index) {
        if (iterator(value, index))
          results.push(value);
      });
      return results;
    },
  
    grep: function(filter, iterator, context) {
      iterator = iterator ? iterator.bind(context) : Prototype.K;
      var results = [];
  
      if (Object.isString(filter))
        filter = new RegExp(filter);
  
      this.each(function(value, index) {
        if (filter.match(value))
          results.push(iterator(value, index));
      });
      return results;
    },
  
    include: function(object) {
      if (Object.isFunction(this.indexOf))
        if (this.indexOf(object) != -1) return true;
  
      var found = false;
      this.each(function(value) {
        if (value == object) {
          found = true;
          throw A(arguments).slice(1);
      return this.map(function(value) {
        return value[method].apply(value, args);
      });
    },
  
    max: function(iterator, context) {
      iterator = iterator ? iterator.bind(context) : Prototype.K;
      var result;
      this.each(function(value, index) {
        value = iterator(value, index);
        if (result == null || value >= result)
          result = value;
      });
      return result;
    },
  
    min: function(iterator, context) {
      iterator = iterator ? iterator.bind(context) : Prototype.K;
      var result;
      this.each(function(value, index) {
        value = iterator(value, index);
        if (result == null || value < result)
          result = value;
      });
      return result;
    },
  
    partition: function(iterator, context) {
      iterator = iterator ? iterator.bind(context) : Prototype.K;
      var trues = [], falses = [];
      this.each(function(value, index) {
        (iterator(value, index) ?
          trues : falses).push(value);
      });
      return [trues, falses];
    },
  
    pluck: function(property) {
      var results = [];
      this.each(function(value) {
        results.push(value[property]);
      });
      return results;
    },
  
    reject: function(iterator, context) {
      iterator = iterator.bind(context);
      var results = [];
      this.each(function(value, index) {
        if (!iterator(value, index))
          results.push(value);
      });
      return results;
    },
  
    sortBy: function(iterator, context) {
      iterator = iterator.bind(context);
      return this.map(function(value, index) {
        return {value: value, criteria: iterator(value, index)};
      }).sort(function(left, right) {
        var a = left.criteria, b = right.criteria;
        return a < b ? -1 : a > b ? 1 : 0;
      }).pluck('value');
    },
  
    toArray: function() {
      return this.map();
    },
  
    zip: function() {
      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));
      });
    },
  
    size: function() {
      return this.toArray().length;
    },
  
    inspect: function() {
      return '#<Enumerable:' + this.toArray().inspect() + '>';
    }
  };
  
  Object.extend(Enumerable, {
    map:     Enumerable.collect,
    find:    Enumerable.detect,
    select:  Enumerable.findAll,
    filter:  Enumerable.findAll,
    member:  Enumerable.include,
    entries: Enumerable.toArray,
    every:   Enumerable.all,
    some:    Enumerable.any
  });
  function $A(iterable)\; \{\; if\; (!iterable)\; return\; [];\; if\; (iterable.toArray)\; return\; iterable.toArray();\; var\; length\; =\; iterable.length\; ||\; 0,\; results\; =\; new\; Array(length);\; while\; (length--)\; results[length]\; =\; iterable[length];\; return\; results;\; \}\; if\; (Prototype.Browser.WebKit)\; \{$A = function(iterable) {
      if (!iterable) return [];
      if (!(Object.isFunction(iterable) && iterable == '[object NodeList]') &&
          iterable.toArray) return iterable.toArray();
      var length = iterable.length || 0, results = new Array(length);
      while (length--) results[length] = iterable[length];
      return results;
    };
  }
  
  Array.from = A(arguments);
      return this.select(function(value) {
        return !values.include(value);
      });
    },
  
    reverse: function(inline) {
      return (inline !== false ? this : this.toArray())._reverse();
    },
  
    reduce: function() {
      return this.length > 1 ? this : this[0];
    },
  
    uniq: function(sorted) {
      return this.inject([], function(array, value, index) {
        if (0 == index || (sorted ? array.last() != value : !array.include(value)))
          array.push(value);
        return array;
      });
    },
  
    intersect: function(array) {
      return this.uniq().findAll(function(item) {
        return array.detect(function(value) { return item === value });
      });
    },
  
    clone: function() {
      return [].concat(this);
    },
  
    size: function() {
      return this.length;
    },
  
    inspect: function() {
      return '[' + this.map(Object.inspect).join(', ') + ']';
    },
  
    toJSON: function() {
      var results = [];
      this.each(function(object) {
        var value = Object.toJSON(object);
        if (!Object.isUndefined(value)) results.push(value);
      });
      return '[' + results.join(', ') + ']';
    }
  });
  
  // use native browser JS 1.6 implementation if available
  if (Object.isFunction(Array.prototype.forEach))
    Array.prototype._each = Array.prototype.forEach;
  
  if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i) {
    i || (i = 0);
    var length = this.length;
    if (i < 0) i = length + i;
    for (; i < length; i++)
      if (this[i] === item) return i;
    return -1;
  };
  
  if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i) {
    i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
    var n = this.slice(0, i).reverse().indexOf(item);
    return (n < 0) ? n : i - n - 1;
  };
  
  Array.prototype.toArray = Array.prototype.clone;
  
  function };
  }
  Object.extend(Number.prototype, {
    toColorPart: function() {
      return this.toPaddedString(2, 16);
    },
  
    succ: function() {
      return this + 1;
    },
  
    times: function(iterator) {
      R(0, this, true).each(iterator);
      return this;
    },
  
    toPaddedString: function(length, radix) {
      var string = this.toString(radix || 10);
      return '0'.times(length - string.length) + string;
    },
  
    toJSON: function() {
      return isFinite(this) ? this.toString() : 'null';
    }
  });
  
  $w(\text{'}abs\; round\; ceil\; floor\text{'}).each(function(method)\{\; Number.prototype[method]\; =\; Math[method].methodize();\; \});\; function$H(object) {
    return new Hash(object);
  };
  
  var Hash = Class.create(Enumerable, (function() {
  
    function toQueryPair(key, value) {
      if (Object.isUndefined(value)) return key;
      return key + '=' + encodeURIComponent(String.interpret(value));
    }
  
    return {
      initialize: function(object) {
        this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
      },
  
      _each: function(iterator) {
        for (var key in this._object) {
          var value = this._object[key], pair = [key, value];
          pair.key = key;
          pair.value = value;
          iterator(pair);
        }
      },
  
      set: function(key, value) {
        return this._object[key] = value;
      },
  
      get: function(key) {
        return this._object[key];
      },
  
      unset: function(key) {
        var value = this._object[key];
        delete this._object[key];
        return value;
      },
  
      toObject: function() {
        return Object.clone(this._object);
      },
  
      keys: function() {
        return this.pluck('key');
      },
  
      values: function() {
        return this.pluck('value');
      },
  
      index: function(value) {
        var match = this.detect(function(pair) {
          return pair.value === value;
        });
        return match && match.key;
      },
  
      merge: function(object) {
        return this.clone().update(object);
      },
  
      update: function(object) {
        return new Hash(object).inject(this, function(result, pair) {
          result.set(pair.key, pair.value);
          return result;
        });
      },
  
      toQueryString: function() {
        return this.map(function(pair) {
          var key = encodeURIComponent(pair.key), values = pair.value;
  
          if (values && typeof values == 'object') {
            if (Object.isArray(values))
              return values.map(toQueryPair.curry(key)).join('&');
          }
          return toQueryPair(key, values);
        }).join('&');
      },
  
      inspect: function() {
        return '#<Hash:{' + this.map(function(pair) {
          return pair.map(Object.inspect).join(': ');
        }).join(', ') + '}>';
      },
  
      toJSON: function() {
        return Object.toJSON(this.toObject());
      },
  
      clone: function() {
        return new Hash(this);
      }
    }
  })());
  
  Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
  Hash.from = R = function(start, end, exclusive) {
    return new ObjectRange(start, end, exclusive);
  };
  
  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) {
      this.responders._each(iterator);
    },
  
    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.isString(this.options.parameters))
        this.options.parameters = this.options.parameters.toQueryParams();
      else 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.clone(this.options.parameters);
  
      if (!['get', 'post'].include(this.method)) {
        // simulate other verbs over post
        params['_method'] = this.method;
        this.method = 'post';
      }
  
      this.parameters = params;
  
      if (params = Object.toQueryString(params)) {
        // when GET, append parameters to URL
        if (this.method == 'get')
          this.url += (this.url.include('?') ? '&' : '?') + params;
        else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
          params += '&_=';
      }
  
      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';
      }
  
      // user-defined headers
      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
          /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') {
        // avoid memory leak in MSIE: clean up
        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;
      json = decodeURIComponent(escape(json));
      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 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);
  }
  
  if (Prototype.BrowserFeatures.XPath) {
    document._getElementsByXPath = function(expression, parentElement) {
      var results = [];
      var query = document.evaluate(expression, parentElement || document,
        null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
      for (var i = 0, length = query.snapshotLength; i < length; i++)
        results.push(Element.extend(query.snapshotItem(i)));
      return results;
    };
  }
  
  /*--------------------------------------------------------------------------*/
  
  if (!window.Node) var Node = { };
  
  if (!Node.ELEMENT_NODE) {
    // DOM level 2 ECMAScript Language Binding
    Object.extend(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
    });
  }
  
  (function() {
    var element = this.Element;
    this.Element = function(tagName, attributes) {
      attributes = attributes || { };
      tagName = tagName.toLowerCase();
      var cache = Element.cache;
      if (Prototype.Browser.IE && attributes.name) {
        tagName = '<' + tagName + ' name="' + attributes.name + '">';
        delete attributes.name;
        return Element.writeAttribute(document.createElement(tagName), attributes);
      }
      if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
      return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
    };
    Object.extend(this.Element, element || { });
  }).call(window);
  
  Element.cache = { };
  
  Element.Methods = {
    visible: function(element) {
      return element.style.display != 'none';
    },
  
    toggle: function(element) {
      element = element;
      Element[Element.visible(element) ? 'hide' : 'show'](element);
      return element;
    },
  
    hide: function(element) {
      element.style.display = 'none';
      return element;
    },
  
    show: function(element) {
      element.style.display = '';
      return element;
    },
  
    remove: function(element) {
      element = element;
      element.parentNode.removeChild(element);
      return element;
    },
  
    update: function(element, content) {
      element = element;
      if (content && content.toElement) content = content.toElement();
      if (Object.isElement(content)) return element.update().insert(content);
      content = Object.toHTML(content);
      element.innerHTML = content.stripScripts();
      content.evalScripts.bind(content).defer();
      return element;
    },
  
    replace: function(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;
    },
  
    insert: function(element, insertions) {
      element = element;
  
      if (Object.isString(insertions) || Object.isNumber(insertions) ||
          Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
            insertions = {bottom:insertions};
  
      var content, insert, tagName, childNodes;
  
      for (var position in insertions) {
        content  = insertions[position];
        position = position.toLowerCase();
        insert = Element._insertionTranslations[position];
  
        if (content && content.toElement) content = content.toElement();
        if (Object.isElement(content)) {
          insert(element, content);
          continue;
        }
  
        content = Object.toHTML(content);
  
        tagName = ((position == 'before' || position == 'after')
          ? element.parentNode : element).tagName.toUpperCase();
  
        childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
  
        if (position == 'top' || position == 'after') childNodes.reverse();
        childNodes.each(insert.curry(element));
  
        content.evalScripts.bind(content).defer();
      }
  
      return element;
    },
  
    wrap: function(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;
    },
  
    inspect: function(element) {
      element = element;
      var result = '<' + element.tagName.toLowerCase();
      A(arguments), element = $(args.shift());
      return Selector.findChildElements(element, args);
    },
  
    adjacent: function() {
      var args = )").test(elementClassName)));
    },
  
    addClassName: function(element, className) {
      if (!(element = element)) return;
      if (!element.hasClassName(className))
        element.className += (element.className ? ' ' : '') + className;
      return element;
    },
  
    removeClassName: function(element, className) {
      if (!(element = element)) return;
      element.className = element.className.replace(
        new RegExp("(^|\\s+)" + className + "(\\s+|};
  
      // All *Width and *Height properties give 0 on elements with display none,
      // so enable the element temporarily
      var els = element.style;
      var originalVisibility = els.visibility;
      var originalPosition = els.position;
      var originalDisplay = els.display;
      els.visibility = 'hidden';
      els.position = 'absolute';
      els.display = 'block';
      var originalWidth = element.clientWidth;
      var originalHeight = element.clientHeight;
      els.display = originalDisplay;
      els.position = originalPosition;
      els.visibility = originalVisibility;
      return {width: originalWidth, height: originalHeight};
    },
  
    makePositioned: function(element) {
      element = element;
      var pos = Element.getStyle(element, 'position');
      if (pos == 'static' || !pos) {
        element._madePositioned = true;
        element.style.position = 'relative';
        // Opera returns the offset relative to the positioning context, when an
        // element is position relative but top and left have not been defined
        if (window.opera) {
          element.style.top = 0;
          element.style.left = 0;
        }
      }
      return element;
    },
  
    undoPositioned: function(element) {
      element = element;
      if (element._madePositioned) {
        element._madePositioned = undefined;
        element.style.position =
          element.style.top =
          element.style.left =
          element.style.bottom =
          element.style.right = '';
      }
      return element;
    },
  
    makeClipping: function(element) {
      element = element;
      if (element._overflow) return element;
      element._overflow = Element.getStyle(element, 'overflow') || 'auto';
      if (element._overflow !== 'hidden')
        element.style.overflow = 'hidden';
      return element;
    },
  
    undoClipping: function(element) {
      element = element;
      if (!element._overflow) return element;
      element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
      element._overflow = null;
      return element;
    },
  
    cumulativeOffset: function(element) {
      var valueT = 0, valueL = 0;
      do {
        valueT += element.offsetTop  || 0;
        valueL += element.offsetLeft || 0;
        element = element.offsetParent;
      } while (element);
      return Element._returnOffset(valueL, valueT);
    },
  
    positionedOffset: function(element) {
      var valueT = 0, valueL = 0;
      do {
        valueT += element.offsetTop  || 0;
        valueL += element.offsetLeft || 0;
        element = element.offsetParent;
        if (element) {
          if (element.tagName == 'BODY') break;
          var p = Element.getStyle(element, 'position');
          if (p !== 'static') break;
        }
      } while (element);
      return Element._returnOffset(valueL, valueT);
    },
  
    absolutize: function(element) {
      element = element;
      if (element.getStyle('position') == 'absolute') return;
      // Position.prepare(); // To be done manually by Scripty when it needs it.
  
      var offsets = element.positionedOffset();
      var top     = offsets[1];
      var left    = offsets[0];
      var width   = element.clientWidth;
      var height  = element.clientHeight;
  
      element._originalLeft   = left - parseFloat(element.style.left  || 0);
      element._originalTop    = top  - parseFloat(element.style.top || 0);
      element._originalWidth  = element.style.width;
      element._originalHeight = element.style.height;
  
      element.style.position = 'absolute';
      element.style.top    = top + 'px';
      element.style.left   = left + 'px';
      element.style.width  = width + 'px';
      element.style.height = height + 'px';
      return element;
    },
  
    relativize: function(element) {
      element = element;
      if (element.getStyle('position') == 'relative') return;
      // Position.prepare(); // To be done manually by Scripty when it needs it.
  
      element.style.position = 'relative';
      var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
      var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);
  
      element.style.top    = top + 'px';
      element.style.left   = left + 'px';
      element.style.height = element._originalHeight;
      element.style.width  = element._originalWidth;
      return element;
    },
  
    cumulativeScrollOffset: function(element) {
      var valueT = 0, valueL = 0;
      do {
        valueT += element.scrollTop  || 0;
        valueL += element.scrollLeft || 0;
        element = element.parentNode;
      } while (element);
      return Element._returnOffset(valueL, valueT);
    },
  
    getOffsetParent: function(element) {
      if (element.offsetParent) return $(element.offsetParent);
      if (element == document.body) return element;
  
      while ((element = element.parentNode) && element != document.body)
        if (Element.getStyle(element, 'position') != 'static')
          return element;
  
      return $(document.body);
    },
  
    viewportOffset: function(forElement) {
      var valueT = 0, valueL = 0;
  
      var element = forElement;
      do {
        valueT += element.offsetTop  || 0;
        valueL += element.offsetLeft || 0;
  
        // Safari fix
        if (element.offsetParent == document.body &&
          Element.getStyle(element, 'position') == 'absolute') break;
  
      } while (element = element.offsetParent);
  
      element = forElement;
      do {
        if (!Prototype.Browser.Opera || element.tagName == 'BODY') {
          valueT -= element.scrollTop  || 0;
          valueL -= element.scrollLeft || 0;
        }
      } while (element = element.parentNode);
  
      return Element._returnOffset(valueL, valueT);
    },
  
    clonePosition: function(element, source) {
      var options = Object.extend({
        setLeft:    true,
        setTop:     true,
        setWidth:   true,
        setHeight:  true,
        offsetTop:  0,
        offsetLeft: 0
      }, arguments[2] || { });
  
      // find page position of source
      source = source;
      var p = source.viewportOffset();
  
      // find coordinate system to use
      element = element;
      var delta = [0, 0];
      var parent = null;
      // delta [0,0] will do fine with position: fixed elements,
      // position:absolute needs offsetParent deltas
      if (Element.getStyle(element, 'position') == 'absolute') {
        parent = element.getOffsetParent();
        delta = parent.viewportOffset();
      }
  
      // correct by body offsets (fixes Safari)
      if (parent == document.body) {
        delta[0] -= document.body.offsetLeft;
        delta[1] -= document.body.offsetTop;
      }
  
      // set position
      if (options.setLeft)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
      if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
      if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
      if (options.setHeight) element.style.height = source.offsetHeight + 'px';
      return element;
    }
  };
  
  Element.Methods.identify.counter = 1;
  
  Object.extend(Element.Methods, {
    getElementsBySelector: Element.Methods.select,
    childElements: Element.Methods.immediateDescendants
  });
  
  Element._attributeTranslations = {
    write: {
      names: {
        className: 'class',
        htmlFor:   'for'
      },
      values: { }
    }
  };
  
  if (Prototype.Browser.Opera) {
    Element.Methods.getStyle = Element.Methods.getStyle.wrap(
      function(proceed, element, style) {
        switch (style) {
          case 'left': case 'top': case 'right': case 'bottom':
            if (proceed(element, 'position') === 'static') return null;
          case 'height': case 'width':
            // returns '0px' for hidden elements; we want it to return null
            if (!Element.visible(element)) return null;
  
            // returns the border-box dimensions rather than the content-box
            // dimensions, so we subtract padding and borders from the value
            var dim = parseInt(proceed(element, style), 10);
  
            if (dim !== element['offset' + style.capitalize()])
              return dim + 'px';
  
            var properties;
            if (style === 'height') {
              properties = ['border-top-width', 'padding-top',
               'padding-bottom', 'border-bottom-width'];
            }
            else {
              properties = ['border-left-width', 'padding-left',
               'padding-right', 'border-right-width'];
            }
            return properties.inject(dim, function(memo, property) {
              var val = proceed(element, property);
              return val === null ? memo : memo - parseInt(val, 10);
            }) + 'px';
          default: return proceed(element, style);
        }
      }
    );
  
    Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
      function(proceed, element, attribute) {
        if (attribute === 'title') return element.title;
        return proceed(element, attribute);
      }
    );
  }
  
  else if (Prototype.Browser.IE) {
    // IE doesn't report offsets correctly for static elements, so we change them
    // to "relative" to get the values, then change them back.
    Element.Methods.getOffsetParent = Element.Methods.getOffsetParent.wrap(
      function(proceed, element) {
        element = element;
        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;
      }
    );
  
    w('positionedOffset viewportOffset').each(function(method) {
      Element.Methods[method] = Element.Methods[method].wrap(
        function(proceed, element) {
          element = element;
          var position = element.getStyle('position');
          if (position !== 'static') return proceed(element);
          // Trigger hasLayout on the offset parent so that IE6 reports
          // accurate offsetTop and offsetLeft values for position: fixed.
          var offsetParent = element.getOffsetParent();
          if (offsetParent && offsetParent.getStyle('position') === 'fixed')
            offsetParent.setStyle({ zoom: 1 });
          element.setStyle({ position: 'relative' });
          var value = proceed(element);
          element.setStyle({ position: position });
          return value;
        }
      );
    });
  
    Element.Methods.getStyle = function(element, style) {
      element = element;
      style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
      var value = element.style[style];
      if (!value && element.currentStyle) value = element.currentStyle[style];
  
      if (style == 'opacity') {
        if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
          if (value[1]) return parseFloat(value[1]) / 100;
        return 1.0;
      }
  
      if (value == 'auto') {
        if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
          return element['offset' + style.capitalize()] + 'px';
        return null;
      }
      return value;
    };
  
    Element.Methods.setOpacity = function(element, value) {
      function stripAlpha(filter){
        return filter.replace(/alpha\([^\)]*\)/gi,'');
      }
      element = element;
      var currentStyle = element.currentStyle;
      if ((currentStyle && !currentStyle.hasLayout) ||
        (!currentStyle && element.style.zoom == 'normal'))
          element.style.zoom = 1;
  
      var filter = element.getStyle('filter'), style = element.style;
      if (value == 1 || value === '') {
        (filter = stripAlpha(filter)) ?
          style.filter = filter : style.removeAttribute('filter');
        return element;
      } else if (value < 0.00001) value = 0;
      style.filter = stripAlpha(filter) +
        'alpha(opacity=' + (value * 100) + ')';
      return element;
    };
  
    Element._attributeTranslations = {
      read: {
        names: {
          'class': 'className',
          'for':   'htmlFor'
        },
        values: {
          _getAttr: function(element, attribute) {
            return element.getAttribute(attribute, 2);
          },
          _getAttrNode: function(element, attribute) {
            var node = element.getAttributeNode(attribute);
            return node ? node.value : "";
          },
          _getEv: function(element, attribute) {
            attribute = element.getAttribute(attribute);
            return attribute ? attribute.toString().slice(23, -2) : null;
          },
          _flag: function(element, attribute) {
            return element.hasAttribute(attribute) ? attribute : null;
          },
          style: function(element) {
            return element.style.cssText.toLowerCase();
          },
          title: function(element) {
            return element.title;
          }
        }
      }
    };
  
    Element._attributeTranslations.write = {
      names: Object.extend({
        cellpadding: 'cellPadding',
        cellspacing: 'cellSpacing'
      }, Element._attributeTranslations.read.names),
      values: {
        checked: function(element, value) {
          element.checked = !!value;
        },
  
        style: function(element, value) {
          element.style.cssText = value ? value : '';
        }
      }
    };
  
    Element._attributeTranslations.has = {};
  
    };
  }
  
  else if (Prototype.Browser.WebKit) {
    Element.Methods.setOpacity = function(element, value) {
      element = element;
      element.style.opacity = (value == 1 || value === '') ? '' :
        (value < 0.00001) ? 0 : value;
  
      if (value == 1)
        if(element.tagName == 'IMG' && element.width) {
          element.width++; element.width--;
        } else try {
          var n = document.createTextNode(' ');
          element.appendChild(n);
          element.removeChild(n);
        } catch (e) { }
  
      return element;
    };
  
    // Safari returns margins on body which is incorrect if the child is absolutely
    // positioned.  For performance reasons, redefine Element#cumulativeOffset for
    // KHTML/WebKit only.
    Element.Methods.cumulativeOffset = function(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 Element._returnOffset(valueL, valueT);
    };
  }
  
  if (Prototype.Browser.IE || Prototype.Browser.Opera) {
    // IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
    Element.Methods.update = function(element, content) {
      element = element;
  
      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 in Element._insertionTranslations.tags) {
        A(element.childNodes).each(function(node) { element.removeChild(node) });
        Element._getContentFromAnonymousElement(tagName, content.stripScripts())
          .each(function(node) { element.appendChild(node) });
      }
      else element.innerHTML = content.stripScripts();
  
      content.evalScripts.bind(content).defer();
      return element;
    };
  }
  
  if ('outerHTML' in document.createElement('div')) {
    Element.Methods.replace = function(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 (Element._insertionTranslations.tags[tagName]) {
        var nextSibling = element.next();
        var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
        parent.removeChild(element);
        if (nextSibling)
          fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
        else
          fragments.each(function(node) { parent.appendChild(node) });
      }
      else element.outerHTML = content.stripScripts();
  
      content.evalScripts.bind(content).defer();
      return element;
    };
  }
  
  Element._returnOffset = function(l, t) {
    var result = [l, t];
    result.left = l;
    result.top = t;
    return result;
  };
  
  Element._getContentFromAnonymousElement = function(tagName, html) {
    var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
    if (t) {
      div.innerHTML = t[0] + html + t[1];
      t[2].times(function() { div = div.firstChild });
    } else div.innerHTML = html;
    return $A(div.childNodes);$};
  
  Element._insertionTranslations = {
    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]
    }
  };
  
  (function() {
    Object.extend(this.tags, {
      THEAD: this.tags.TBODY,
      TFOOT: this.tags.TBODY,
      TH:    this.tags.TD
    });
  }).call(Element._insertionTranslations);
  
  Element.Methods.Simulated = {
    hasAttribute: function(element, attribute) {
      attribute = Element._attributeTranslations.has[attribute] || attribute;
      var node = element.getAttributeNode(attribute);
      return node && node.specified;
    }
  };
  
  Element.Methods.ByTag = { };
  
  Object.extend(Element, Element.Methods);
  
  if (!Prototype.BrowserFeatures.ElementExtensions &&
      document.createElement('div').__proto__) {
    window.HTMLElement = { };
    window.HTMLElement.prototype = document.createElement('div').__proto__;
    Prototype.BrowserFeatures.ElementExtensions = true;
  }
  
  Element.extend = (function() {
    if (Prototype.BrowserFeatures.SpecificElementExtensions)
      return Prototype.K;
  
    var Methods = { }, ByTag = Element.Methods.ByTag;
  
    var extend = Object.extend(function(element) {
      if (!element || element._extendedByPrototype ||
          element.nodeType != 1 || element == window) return element;
  
      var methods = Object.clone(Methods),
        tagName = element.tagName, property, value;
  
      // extend methods for specific tags
      if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);
  
      for (property in methods) {
        value = methods[property];
        if (Object.isFunction(value) && !(property in element))
          element[property] = value.methodize();
      }
  
      element._extendedByPrototype = Prototype.emptyFunction;
      return element;
  
    }, {
      refresh: function() {
        // extend methods for all tags (Safari doesn't need this)
        if (!Prototype.BrowserFeatures.ElementExtensions) {
          Object.extend(Methods, Element.Methods);
          Object.extend(Methods, Element.Methods.Simulated);
        }
      }
    });
  
    extend.refresh();
    return extend;
  })();
  
  Element.hasAttribute = function(element, attribute) {
    if (element.hasAttribute) return element.hasAttribute(attribute);
    return Element.Methods.Simulated.hasAttribute(element, attribute);
  };
  
  Element.addMethods = function(methods) {
    var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;
  
    if (!methods) {
      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)
      });
    }
  
    if (arguments.length == 2) {
      var tagName = methods;
      methods = arguments[1];
    }
  
    if (!tagName) Object.extend(Element.Methods, methods || { });
    else {
      if (Object.isArray(tagName)) tagName.each(extend);
      else extend(tagName);
    }
  
    function extend(tagName) {
      tagName = tagName.toUpperCase();
      if (!Element.Methods.ByTag[tagName])
        Element.Methods.ByTag[tagName] = { };
      Object.extend(Element.Methods.ByTag[tagName], methods);
    }
  
    function copy(methods, destination, onlyIfAbsent) {
      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];
  
      window[klass] = { };
      window[klass].prototype = document.createElement(tagName).__proto__;
      return window[klass];
    }
  
    if (F.ElementExtensions) {
      copy(Element.Methods, HTMLElement.prototype);
      copy(Element.Methods.Simulated, HTMLElement.prototype, true);
    }
  
    if (F.SpecificElementExtensions) {
      for (var tag in Element.Methods.ByTag) {
        var klass = findDOMClass(tag);
        if (Object.isUndefined(klass)) continue;
        copy(T[tag], klass.prototype);
      }
    }
  
    Object.extend(Element, Element.Methods);
    delete Element.ByTag;
  
    if (Element.extend.refresh) Element.extend.refresh();
    Element.cache = { };
  };
  
  document.viewport = {
    getDimensions: function() {
      var dimensions = { };
      var B = Prototype.Browser;
      w('width height').each(function(d) {
        var D = d.capitalize();
        dimensions[d] = (B.WebKit && !document.evaluate) ? self['inner' + D] :
          (B.Opera) ? document.body['client' + D] : document.documentElement['client' + D];
      });
      return dimensions;
    },
  
    getWidth: function() {
      return this.getDimensions().width;
    },
  
    getHeight: function() {
      return this.getDimensions().height;
    },
  
    getScrollOffsets: function() {
      return Element._returnOffset(
        window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
        window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
    }
  };
  /* Portions of the Selector class are derived from Jack Slocum’s DomQuery,
   * part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
   * license.  Please see http://www.yui-ext.com/ for more information. */
  
  var Selector = Class.create({
    initialize: function(expression) {
      this.expression = expression.strip();
      this.compileMatcher();
    },
  
    shouldUseXPath: function() {
      if (!Prototype.BrowserFeatures.XPath) return false;
  
      var e = this.expression;
  
      // Safari 3 chokes on :*-of-type and :empty
      if (Prototype.Browser.WebKit &&
       (e.include("-of-type") || e.include(":empty")))
        return false;
  
      // XPath can't do namespaced attributes, nor can it read
      // the "checked" property from DOM nodes
      if ((/(\[[\w-]*?:|:checked)/).test(this.expression))
        return false;
  
      return true;
    },
  
    compileMatcher: function() {
      if (this.shouldUseXPath())
        return this.compileXPathMatcher();
  
      var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
          c = Selector.criteria, le, p, m;
  
      if (Selector._cache[e]) {
        this.matcher = Selector._cache[e];
        return;
      }
  
      this.matcher = ["this.matcher = function(root) {",
                      "var r = root, h = Selector.handlers, c = false, n;"];
  
      while (e && le != e && (/\S/).test(e)) {
        le = e;
        for (var i in ps) {
          p = ps[i];
          if (m = e.match(p)) {
            this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
                    new Template(c[i]).evaluate(m));
            e = e.replace(m[0], '');
            break;
          }
        }
      }
  
      this.matcher.push("return h.unique(n);\n}");
      eval(this.matcher.join('\n'));
      Selector._cache[this.expression] = this.matcher;
    },
  
    compileXPathMatcher: function() {
      var e = this.expression, ps = Selector.patterns,
          x = Selector.xpath, le, m;
  
      if (Selector._cache[e]) {
        this.xpath = Selector._cache[e]; return;
      }
  
      this.matcher = ['.//*'];
      while (e && le != e && (/\S/).test(e)) {
        le = e;
        for (var i in ps) {
          if (m = e.match(ps[i])) {
            this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
              new Template(x[i]).evaluate(m));
            e = e.replace(m[0], '');
            break;
          }
        }
      }
  
      this.xpath = this.matcher.join('');
      Selector._cache[this.expression] = this.xpath;
    },
  
    findElements: function(root) {
      root = root || document;
      if (this.xpath) return document._getElementsByXPath(this.xpath, root);
      return this.matcher(root);
    },
  
    match: function(element) {
      this.tokens = [];
  
      var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
      var le, p, m;
  
      while (e && le !== e && (/\S/).test(e)) {
        le = e;
        for (var i in ps) {
          p = ps[i];
          if (m = e.match(p)) {
            // use the Selector.assertions methods unless the selector
            // is too complex.
            if (as[i]) {
              this.tokens.push([i, Object.clone(m)]);
              e = e.replace(m[0], '');
            } else {
              // reluctantly do a document-wide search
              // and look for a match in the array
              return this.findElements(document).include(element);
            }
          }
        }
      }
  
      var match = true, name, matches;
      for (var i = 0, token; token = this.tokens[i]; i++) {
        name = token[0], matches = token[1];
        if (!Selector.assertions[name](element, matches)) {
          match = false; break;
        }
      }
  
      return match;
    },
  
    toString: function() {
      return this.expression;
    },
  
    inspect: function() {
      return "#<Selector:" + this.expression.inspect() + ">";
    }
  });
  
  Object.extend(Selector, {
    _cache: { },
  
    xpath: {
      descendant:   "//*",
      child:        "/*",
      adjacent:     "/following-sibling::*[1]",
      laterSibling: '/following-sibling::*',
      tagName:      function(m) {
        if (m[1] == '*') return '';
        return "[local-name()='" + m[1].toLowerCase() +
               "' or local-name()='" + m[1].toUpperCase() + "']";
      },
      className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
      id:           "[@id='#{1}']",
      attrPresence: function(m) {
        m[1] = m[1].toLowerCase();
        return new Template("[@#{1}]").evaluate(m);
      },
      attr: function(m) {
        m[1] = m[1].toLowerCase();
        m[3] = m[5] || m[6];
        return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
      },
      pseudo: function(m) {
        var h = Selector.xpath.pseudos[m[1]];
        if (!h) return '';
        if (Object.isFunction(h)) return h(m);
        return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
      },
      operators: {
        '=':  "[@#{1}='#{3}']",
        '!=': "[@#{1}!='#{3}']",
        '^=': "[starts-with(@#{1}, '#{3}')]",
        '/)) // digit only
            return '[' + fragment + "= " + mm[1] + ']';
          if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
            if (mm[1] == "-") mm[1] = -1;
            var a = mm[1] ? Number(mm[1]) : 1;
            var b = mm[2] ? Number(mm[2]) : 0;
            predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
            "((#{fragment} - #{b}) div #{a} >= 0)]";
            return new Template(predicate).evaluate({
              fragment: fragment, a: a, b: b });
          }
        }
      }
    },
  
    criteria: {
      tagName:      'n = h.tagName(n, r, "#{1}", c);      c = false;',
      className:    'n = h.className(n, r, "#{1}", c);    c = false;',
      id:           'n = h.id(n, r, "#{1}", c);           c = false;',
      attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
      attr: function(m) {
        m[3] = (m[5] || m[6]);
        return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
      },
      pseudo: function(m) {
        if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
        return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
      },
      descendant:   'c = "descendant";',
      child:        'c = "child";',
      adjacent:     'c = "adjacent";',
      laterSibling: 'c = "laterSibling";'
    },
  
    patterns: {
      // combinators must be listed first
      // (and descendant needs to be last combinator)
      laterSibling: /^\s*~\s*/,
      child:        /^\s*>\s*/,
      adjacent:     /^\s*\+\s*/,
      descendant:   /^\s/,
  
      // selectors follow
      tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,\; id:\; /^\#([\backslash w\backslash -\backslash *]+)(\backslash b|$)/,
      className:    /^\.([\w\-\*]+)(\b|$)/,\; pseudo:\; /^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\backslash ((.*?)\backslash ))?(\backslash b|$|(?=\s|[:+~>]))/,
      attrPresence: /^\[([\w]+)\]/,
      attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^R(1, total).inject([], function(memo, i) {
          if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
          return memo;
        });
      },
  
      // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
      nth: function(nodes, formula, root, reverse, ofType) {
        if (nodes.length == 0) return [];
        if (formula == 'even') formula = '2n+0';
        if (formula == 'odd')  formula = '2n+1';
        var h = Selector.handlers, results = [], indexed = [], m;
        h.mark(nodes);
        for (var i = 0, node; node = nodes[i]; i++) {
          if (!node.parentNode._countedByPrototype) {
            h.index(node.parentNode, reverse, ofType);
            indexed.push(node.parentNode);
          }
        }
        if (formula.match(/^\d+/))) continue;
          results.push(node);
        }
        return results;
      },
  
      'not': function(nodes, selector, root) {
        var h = Selector.handlers, selectorType, m;
        var exclusions = new Selector(selector).findElements(root);
        h.mark(exclusions);
        for (var i = 0, results = [], node; node = nodes[i]; i++)
          if (!node._countedByPrototype) results.push(node);
        h.unmark(exclusions);
        return results;
      },
  
      'enabled': function(nodes, value, root) {
        for (var i = 0, results = [], node; node = nodes[i]; i++)
          if (!node.disabled) results.push(node);
        return results;
      },
  
      'disabled': function(nodes, value, root) {
        for (var i = 0, results = [], node; node = nodes[i]; i++)
          if (node.disabled) results.push(node);
        return results;
      },
  
      'checked': function(nodes, value, root) {
        for (var i = 0, results = [], node; node = nodes[i]; i++)
          if (node.checked) results.push(node);
        return results;
      }
    },
  
    operators: {
      '=':  function(nv, v) { return nv == v; },
      '!=': function(nv, v) { return nv != v; },
      '^=': function(nv, v) { return nv.startsWith(v); },
      '$=\text{'}:\; function(nv,\; v)\; \{\; return\; nv.endsWith(v);\; \},\; \text{'}*=\text{'}:\; function(nv,\; v)\; \{\; return\; nv.include(v);\; \},\; \text{'}~=\text{'}:\; function(nv,\; v)\; \{\; return\; (\text{'}\; \text{'}\; +\; nv\; +\; \text{'}\; \text{'}).include(\text{'}\; \text{'}\; +\; v\; +\; \text{'}\; \text{'});\; \},\; \text{'}|=\text{'}:\; function(nv,\; v)\; \{\; return\; (\text{'}-\text{'}\; +\; nv.toUpperCase()\; +\; \text{'}-\text{'}).include(\text{'}-\text{'}\; +\; v.toUpperCase()\; +\; \text{'}-\text{'});\; \}\; \},\; split:\; function(expression)\; \{\; var\; expressions\; =\; [];\; expression.scan(/(([\backslash w\#:.~>+()\backslash s-]+|\backslash *|\backslash [.*?\backslash ])+)\backslash s*(,|$)/, function(m) {
        expressions.push(m[1].strip());
      });
      return expressions;
    },
  
    matchElements: function(elements, expression) {
      var matches = $$(expression), h = Selector.handlers;
      h.mark(matches);
      for (var i = 0, results = [], element; element = elements[i]; i++)
        if (element._countedByPrototype) results.push(element);
      h.unmark(matches);
      return results;
    },
  
    findElement: function(elements, expression, index) {
      if (Object.isNumber(expression)) {
        index = expression; expression = false;
      }
      return Selector.matchElements(elements, expression || '*')[index || 0];
    },
  
    findChildElements: function(element, expressions) {
      expressions = Selector.split(expressions.join(','));
      var results = [], h = Selector.handlers;
      for (var i = 0, l = expressions.length, selector; i < l; i++) {
        selector = new Selector(expressions[i].strip());
        h.concat(results, selector.findElements(element));
      }
      return (l > 1) ? h.unique(results) : results;
    }
  });
  
  if (Prototype.Browser.IE) {
    Object.extend(Selector.handlers, {
      // IE returns comment nodes on getElementsByTagName("*").
      // Filter them out.
      concat: function(a, b) {
        for (var i = 0, node; node = b[i]; i++)
          if (node.tagName !== "!") a.push(node);
        return a;
      },
  
      // IE improperly serializes _countedByPrototype in (inner|outer)HTML.
      unmark: function(nodes) {
        for (var i = 0, node; node = nodes[i]; i++)
          node.removeAttribute('_countedByPrototype');
        return nodes;
      }
    });
  }
  
  function $$() {
    return Selector.findChildElements(document, $A(arguments));\; \}\; var\; Form\; =\; \{\; reset:\; function(form)\; \{\; form.reset();\; return\; form;\; \},\; serializeElements:\; function(elements,\; options)\; \{\; if\; (typeof\; options\; !=\; \text{'}object\text{'})\; options\; =\; \{\; hash:\; !!options$};
      else if (Object.isUndefined(options.hash)) options.hash = true;
      var key, value, submitted = false, submit = options.submit;
  
      var data = elements.inject({ }, function(result, element) {
        if (!element.disabled && element.name) {
          key = element.name; value = element.getValue();
          if (value != null && (element.type != 'submit' || (!submitted &&
              submit !== false && (!submit || key == submit) && (submitted = true)))) {
            if (key in result) {
              // a key is already present; construct an array of values
              if (!Object.isArray(result[key])) result[key] = [result[key]];
              result[key].push(value);
            }
            else result[key] = value;
          }
        }
        return result;
      });
  
      return options.hash ? data : Object.toQueryString(data);
    }
  };
  
  Form.Methods = {
    serialize: function(form, options) {
      return Form.serializeElements(Form.getElements(form), options);
    },
  
    getElements: function(form) {
      return A(form.getElementsByTagName('*')).inject([],
        function(elements, child) {
          if (Form.Element.Serializers[child.tagName.toLowerCase()])
            elements.push(Element.extend(child));
          return elements;
        }
      );
    },
  
    getInputs: function(form, typeName, name) {
      form = form;
      var inputs = form.getElementsByTagName('input');
  
      if (!typeName && !name) return };
  
  /*--------------------------------------------------------------------------*/
  
  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'].include(element.type)))
          element.select();
      } catch (e) { }
      return element;
    },
  
    disable: function(element) {
      element = element;
      element.blur();
      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 = {
    input: function(element, value) {
      switch (element.type.toLowerCase()) {
        case 'checkbox':
        case 'radio':
          return Form.Element.Serializers.inputSelector(element, value);
        default:
          return Form.Element.Serializers.textarea(element, value);
      }
    },
  
    inputSelector: function(element, value) {
      if (Object.isUndefined(value)) return element.checked ? element.value : null;
      else element.checked = !!value;
    },
  
    textarea: function(element, value) {
      if (Object.isUndefined(value)) return element.value;
      else element.value = value;
    },
  
    select: function(element, index) {
      if (Object.isUndefined(index))
        return this[element.type == 'select-one' ?
          'selectOne' : 'selectMany'](element);
      else {
        var opt, value, single = !Object.isArray(index);
        for (var i = 0, length = element.length; i < length; i++) {
          opt = element.options[i];
          value = this.optionValue(opt);
          if (single) {
            if (value == index) {
              opt.selected = true;
              return;
            }
          }
          else opt.selected = index.include(value);
        }
      }
    },
  
    selectOne: function(element) {
      var index = element.selectedIndex;
      return index >= 0 ? this.optionValue(element.options[index]) : null;
    },
  
    selectMany: function(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(this.optionValue(opt));
      }
      return values;
    },
  
    optionValue: function(opt) {
      // extend element because hasAttribute may not be native
      return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
    }
  };
  
  /*--------------------------------------------------------------------------*/
  
  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);
    }
  });
  if (!window.Event) var Event = { };
  
  Object.extend(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,
  
    cache: { },
  
    relatedTarget: function(event) {
      var element;
      switch(event.type) {
        case 'mouseover': element = event.fromElement; break;
        case 'mouseout':  element = event.toElement;   break;
        default: return null;
      }
      return Element.extend(element);
    }
  });
  
  Event.Methods = (function() {
    var isButton;
  
    if (Prototype.Browser.IE) {
      var buttonMap = { 0: 1, 1: 4, 2: 2 };
      isButton = function(event, code) {
        return event.button == buttonMap[code];
      };
  
    } else if (Prototype.Browser.WebKit) {
      isButton = function(event, code) {
        switch (code) {
          case 0: return event.which == 1 && !event.metaKey;
          case 1: return event.which == 1 && event.metaKey;
          default: return false;
        }
      };
  
    } else {
      isButton = function(event, code) {
        return event.which ? (event.which === code + 1) : (event.button === code);
      };
    }
  
    return {
      isLeftClick:   function(event) { return isButton(event, 0) },
      isMiddleClick: function(event) { return isButton(event, 1) },
      isRightClick:  function(event) { return isButton(event, 2) },
  
      element: function(event) {
        var node = Event.extend(event).target;
        return Element.extend(node.nodeType == Node.TEXT_NODE ? node.parentNode : node);
      },
  
      findElement: function(event, expression) {
        var element = Event.element(event);
        if (!expression) return element;
        var elements = [element].concat(element.ancestors());
        return Selector.findElement(elements, expression, 0);
      },
  
      pointer: function(event) {
        return {
          x: event.pageX || (event.clientX +
            (document.documentElement.scrollLeft || document.body.scrollLeft)),
          y: event.pageY || (event.clientY +
            (document.documentElement.scrollTop || document.body.scrollTop))
        };
      },
  
      pointerX: function(event) { return Event.pointer(event).x },
      pointerY: function(event) { return Event.pointer(event).y },
  
      stop: function(event) {
        Event.extend(event);
        event.preventDefault();
        event.stopPropagation();
        event.stopped = true;
      }
    };
  })();
  
  Event.extend = (function() {
    var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
      m[name] = Event.Methods[name].methodize();
      return m;
    });
  
    if (Prototype.Browser.IE) {
      Object.extend(methods, {
        stopPropagation: function() { this.cancelBubble = true },
        preventDefault:  function() { this.returnValue = false },
        inspect: function() { return "[object Event]" }
      });
  
      return function(event) {
        if (!event) return false;
        if (event._extendedByPrototype) return event;
  
        event._extendedByPrototype = Prototype.emptyFunction;
        var pointer = Event.pointer(event);
        Object.extend(event, {
          target: event.srcElement,
          relatedTarget: Event.relatedTarget(event),
          pageX:  pointer.x,
          pageY:  pointer.y
        });
        return Object.extend(event, methods);
      };
  
    } else {
      Event.prototype = Event.prototype || document.createEvent("HTMLEvents").__proto__;
      Object.extend(Event.prototype, methods);
      return Prototype.K;
    }
  })();
  
  Object.extend(Event, (function() {
    var cache = Event.cache;
  
    function getEventID(element) {
      if (element._prototypeEventID) return element._prototypeEventID[0];
      arguments.callee.id = arguments.callee.id || 1;
      return element._prototypeEventID = [++arguments.callee.id];
    }
  
    function getDOMEventName(eventName) {
      if (eventName && eventName.include(':')) return "dataavailable";
      return eventName;
    }
  
    function getCacheForID(id) {
      return cache[id] = cache[id] || { };
    }
  
    function getWrappersForEventName(id, eventName) {
      var c = getCacheForID(id);
      return c[eventName] = c[eventName] || [];
    }
  
    function createWrapper(element, eventName, handler) {
      var id = getEventID(element);
      var c = getWrappersForEventName(id, eventName);
      if (c.pluck("handler").include(handler)) return false;
  
      var wrapper = function(event) {
        if (!Event || !Event.extend ||
          (event.eventName && event.eventName != eventName))
            return false;
  
        Event.extend(event);
        handler.call(element, event);
      };
  
      wrapper.handler = handler;
      c.push(wrapper);
      return wrapper;
    }
  
    function findWrapper(id, eventName, handler) {
      var c = getWrappersForEventName(id, eventName);
      return c.find(function(wrapper) { return wrapper.handler == handler });
    }
  
    function destroyWrapper(id, eventName, handler) {
      var c = getCacheForID(id);
      if (!c[eventName]) return false;
      c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
    }
  
    function destroyCache() {
      for (var id in cache)
        for (var eventName in cache[id])
          cache[id][eventName] = null;
    }
  
    if (window.attachEvent) {
      window.attachEvent("onunload", destroyCache);
    }
  
    return {
      observe: function(element, eventName, handler) {
        element = element;
        var name = getDOMEventName(eventName);
  
        var wrapper = createWrapper(element, eventName, handler);
        if (!wrapper) return element;
  
        if (element.addEventListener) {
          element.addEventListener(name, wrapper, false);
        } else {
          element.attachEvent("on" + name, wrapper);
        }
  
        return element;
      },
  
      stopObserving: function(element, eventName, handler) {
        element = element;
        var id = getEventID(element), name = getDOMEventName(eventName);
  
        if (!handler && eventName) {
          getWrappersForEventName(id, eventName).each(function(wrapper) {
            element.stopObserving(eventName, wrapper.handler);
          });
          return element;
  
        } else if (!eventName) {
          Object.keys(getCacheForID(id)).each(function(eventName) {
            element.stopObserving(eventName);
          });
          return element;
        }
  
        var wrapper = findWrapper(id, eventName, handler);
        if (!wrapper) return element;
  
        if (element.removeEventListener) {
          element.removeEventListener(name, wrapper, false);
        } else {
          element.detachEvent("on" + name, wrapper);
        }
  
        destroyWrapper(id, eventName, handler);
  
        return element;
      },
  
      fire: function(element, eventName, memo) {
        element = element;
        if (element == document && document.createEvent && !element.dispatchEvent)
          element = document.documentElement;
  
        var event;
        if (document.createEvent) {
          event = document.createEvent("HTMLEvents");
          event.initEvent("dataavailable", true, true);
        } else {
          event = document.createEventObject();
          event.eventType = "ondataavailable";
        }
  
        event.eventName = eventName;
        event.memo = memo || { };
  
        if (document.createEvent) {
          element.dispatchEvent(event);
        } else {
          element.fireEvent(event.eventType, event);
        }
  
        return Event.extend(event);
      }
    };
  })());
  
  Object.extend(Event, Event.Methods);
  
  Element.addMethods({
    fire:          Event.fire,
    observe:       Event.observe,
    stopObserving: Event.stopObserving
  });
  
  Object.extend(document, {
    fire:          Element.Methods.fire.methodize(),
    observe:       Element.Methods.observe.methodize(),
    stopObserving: Element.Methods.stopObserving.methodize(),
    loaded:        false
  });
  
  (function() {
    /* Support for the DOMContentLoaded event is based on work by Dan Webb,
       Matthias Miller, Dean Edwards and John Resig. */
  
    var timer;
  
    function fireContentLoadedEvent() {
      if (document.loaded) return;
      if (timer) window.clearInterval(timer);
      document.fire("dom:loaded");
      document.loaded = true;
    }
  
    if (document.addEventListener) {
      if (Prototype.Browser.WebKit) {
        timer = window.setInterval(function() {
          if (/loaded|complete/.test(document.readyState))
            fireContentLoadedEvent();
        }, 0);
  
        Event.observe(window, "load", fireContentLoadedEvent);
  
      } else {
        document.addEventListener("DOMContentLoaded",
          fireContentLoadedEvent, false);
      }
  
    } else {
      document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
      $("__onDOMContentLoaded").onreadystatechange = function() {
        if (this.readyState == "complete") {
          this.onreadystatechange = null;
          fireContentLoadedEvent();
        }
      };
    }
  })();
  /*------------------------------- 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 $continue\; =\; new\; Error(\text{'}"throw$continue" is deprecated, use "return" instead');
  
  // This should be moved to script.aculo.us; notice the deprecated methods
  // further below, that map to the newer Element methods.
  var Position = {
    // set to true if needed, warning: firefox performance problems
    // NOT neeeded for page scrolling, only if draggable contained in
    // scrollable elements
    includeScrollOffsets: false,
  
    // must be called before calling withinIncludingScrolloffset, every time the
    // page is scrolled
    prepare: function() {
      this.deltaX =  window.pageXOffset
                  || document.documentElement.scrollLeft
                  || document.body.scrollLeft
                  || 0;
      this.deltaY =  window.pageYOffset
                  || document.documentElement.scrollTop
                  || document.body.scrollTop
                  || 0;
    },
  
    // caches x/y coordinate pair to use with overlap
    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);
    },
  
    // within must be called directly before
    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;
    },
  
    // Deprecation layer -- use newer Element methods now (1.5.2).
  
    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) ? $w(className).map(iter).join(\text{'}\text{'})\; :\; iter(className);\; return\; cond\; ?\; document.\_getElementsByXPath(\text{'}.$//*' + 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) {
      this.element.className.split(/\s+/).select(function(name) {
        return name.length > 0;
      })._each(iterator);
    },
  
    set: function(className) {
      this.element.className = className;
    },
  
    add: function(classNameToAdd) {
      if (this.include(classNameToAdd)) return;
      this.set($A(this).concat(classNameToAdd).join(\text{'}\; \text{'}));\; \},\; remove:\; function(classNameToRemove)\; \{\; if\; (!this.include(classNameToRemove))\; return;\; this.set($A(this).without(classNameToRemove).join(' '));
    },
  
    toString: function() {
      return $A(this).join(\text{'}\; \text{'});\; \}$};
  
  Object.extend(Element.ClassNames.prototype, Enumerable);
  
  /*--------------------------------------------------------------------------*/
  
  Element.addMethods();