/*  Prototype JavaScript framework, version 1.6.0
*  (c) 2005-2007 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',

 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;

if (Prototype.Browser.WebKit)
 Prototype.BrowserFeatures.XPath = 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 === undefined) return 'undefined';
    if (object === null) return 'null';
    return object.inspect ? object.inspect() : object.toString();
  } 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 (value !== undefined)
      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 && object.constructor === Array;
 },

 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 && arguments[0] === undefined) 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(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
};

/*--------------------------------------------------------------------------*/

var PeriodicalExecuter = Class.create({
 initialize: function(callback, frequency) {
  this.callback = callback;
  this.frequency = frequency;
  this.currentlyExecuting = false;

  this.registerCallback();
 },

 registerCallback: function() {
  this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
 },

 execute: function() {
  this.callback(this);
 },

 stop: function() {
  if (!this.timer) return;
  clearInterval(this.timer);
  this.timer = null;
 },

 onTimerEvent: function() {
  if (!this.currentlyExecuting) {
    try {
      this.currentlyExecuting = true;
      this.execute();
    } 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 = count === undefined ? 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 = truncation === undefined ? '...' : 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('', function(memo, node) { return memo+node.nodeValue }) :
    div.childNodes[0].nodeValue) : '';
 },

 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.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
  return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
 },

 evalJSON: function(sanitize) {
  var json = this.unfilterJSON();
  try {
    if (!sanitize || json.isJSON()) return eval('(' + json + ')');
  } catch (e) { }
  throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
 },

 include: function(pattern) {
  return this.indexOf(pattern) > -1;
 },

 startsWith: function(pattern) {
  return this.indexOf(pattern) === 0;
 },

 endsWith: function(pattern) {
  var d = this.length - pattern.length;
  return d >= 0 && this.lastIndexOf(pattern) === d;
 },

 empty: function() {
  return this == '';
 },

 blank: function() {
  return /^\s*$/.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('[') ? match[2].gsub('\\\\]', ']') : match[1];
      ctx = ctx[comp];
      if (null == ctx || '' == match[3]) break;
      expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
      match = pattern.exec(expr);
    }

    return before + String.interpret(ctx);
  }.bind(this));
 }
});
Template.Pattern = /(^|.|\r|\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) throw e;
  }
  return this;
 },

 eachSlice: function(number, iterator, context) {
  iterator = iterator ? iterator.bind(context) : Prototype.K;
  var index = -number, slices = [], array = this.toArray();
  while ((index += number) < array.length)
    slices.push(array.slice(index, index+number));
  return slices.collect(iterator, context);
 },

 all: function(iterator, context) {
  iterator = iterator ? iterator.bind(context) : Prototype.K;
  var result = true;
  this.each(function(value, index) {
    result = result && !!iterator(value, index);
    if (!result) throw $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 $break;
    }
  });
  return found;
 },

 inGroupsOf: function(number, fillWith) {
  fillWith = fillWith === undefined ? null : fillWith;
  return this.eachSlice(number, function(slice) {
    while(slice.length < number) slice.push(fillWith);
    return slice;
  });
 },

 inject: function(memo, iterator, context) {
  iterator = iterator.bind(context);
  this.each(function(value, index) {
    memo = iterator(memo, value, index);
  });
  return memo;
 },

 invoke: function(method) {
  var args = $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 == undefined || 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 == undefined || 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, results = new Array(length);
 while (length--) results[length] = iterable[length];
 return results;
}

if (Prototype.Browser.WebKit) {
 function $A(iterable) {
  if (!iterable) return [];
  if (!(Object.isFunction(iterable) && iterable == '[object NodeList]') &&
      iterable.toArray) return iterable.toArray();
  var length = iterable.length, results = new Array(length);
  while (length--) results[length] = iterable[length];
  return results;
 }
}

Array.from = $A;

Object.extend(Array.prototype, Enumerable);

if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;

Object.extend(Array.prototype, {
 _each: function(iterator) {
  for (var i = 0, length = this.length; i < length; i++)
    iterator(this[i]);
 },

 clear: function() {
  this.length = 0;
  return this;
 },

 first: function() {
  return this[0];
 },

 last: function() {
  return this[this.length - 1];
 },

 compact: function() {
  return this.select(function(value) {
    return value != null;
  });
 },

 flatten: function() {
  return this.inject([], function(array, value) {
    return array.concat(Object.isArray(value) ?
      value.flatten() : [value]);
  });
 },

 without: function() {
  var values = $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 (value !== undefined) 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 $w(string) {
 if (!Object.isString(string)) return [];
 string = string.strip();
 return string ? string.split(/\s+/) : [];
}

if (Prototype.Browser.Opera){
 Array.prototype.concat = function() {
  var array = [];
  for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
  for (var i = 0, length = arguments.length; i < length; i++) {
    if (Object.isArray(arguments[i])) {
      for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
        array.push(arguments[i][j]);
    } else {
      array.push(arguments[i]);
    }
  }
  return array;
 };
}
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('abs round ceil floor').each(function(method){
 Number.prototype[method] = Math[method].methodize();
});
function $H(object) {
 return new Hash(object);
};

var Hash = Class.create(Enumerable, (function() {
 if (function() {
  var i = 0, Test = function(value) { this.key = value };
  Test.prototype.key = 'foo';
  for (var property in new Test('bar')) i++;
  return i > 1;
 }()) {
  function each(iterator) {
    var cache = [];
    for (var key in this._object) {
      var value = this._object[key];
      if (cache.include(key)) continue;
      cache.push(key);
      var pair = [key, value];
      pair.key = key;
      pair.value = value;
      iterator(pair);
    }
  }
 } else {
  function each(iterator) {
    for (var key in this._object) {
      var value = this._object[key], pair = [key, value];
      pair.key = key;
      pair.value = value;
      iterator(pair);
    }
  }
 }

 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: each,

  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 = $H;
var ObjectRange = Class.create(Enumerable, {
 initialize: function(start, end, exclusive) {
  this.start = start;
  this.end = end;
  this.exclusive = exclusive;
 },

 _each: function(iterator) {
  var value = this.start;
  while (this.include(value)) {
    iterator(value);
    value = value.succ();
  }
 },

 include: function(value) {
  if (value < this.start)
    return false;
  if (this.exclusive)
    return value < this.end;
  return value <= this.end;
 }
});

var $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();
 }
});

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
      $H(extras).each(function(pair) { headers[pair.key] = pair.value });
  }

  for (var name in headers)
    this.transport.setRequestHeader(name, headers[name]);
 },

 success: function() {
  var status = this.getStatus();
  return !status || (status >= 200 && status < 300);
 },

 getStatus: function() {
  try {
    return this.transport.status || 0;
  } catch (e) { return 0 }
 },

 respondToReadyState: function(readyState) {
  var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);

  if (state == 'Complete') {
    try {
      this._complete = true;
      (this.options['on' + response.status]
       || this.options['on' + (this.success() ? 'Success' : 'Failure')]
       || Prototype.emptyFunction)(response, response.headerJSON);
    } catch (e) {
      this.dispatchException(e);
    }

    var contentType = response.getHeader('Content-type');
    if (this.options.evalJS == 'force'
        || (this.options.evalJS && contentType
        && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
      this.evalResponse();
  }

  try {
    (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
    Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
  } catch (e) {
    this.dispatchException(e);
  }

  if (state == 'Complete') {
    // avoid memory leak in MSIE: clean up
    this.transport.onreadystatechange = Prototype.emptyFunction;
  }
 },

 getHeader: function(name) {
  try {
    return this.transport.getResponseHeader(name);
  } 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  = xml === undefined ? 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);
  } 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')))
      return null;
  try {
    return this.transport.responseText.evalJSON(options.sanitizeJSON);
  } 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 = options || { };
  var onComplete = options.onComplete;
  options.onComplete = (function(response, param) {
    this.updateContent(response.responseText);
    if (Object.isFunction(onComplete)) onComplete(response, param);
  }).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);
  }

  if (this.success()) {
    if (this.onComplete) this.onComplete.bind(this).defer();
  }
 }
});

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, t, range;

  for (position in insertions) {
    content  = insertions[position];
    position = position.toLowerCase();
    t = Element._insertionTranslations[position];

    if (content && content.toElement) content = content.toElement();
    if (Object.isElement(content)) {
      t.insert(element, content);
      continue;
    }

    content = Object.toHTML(content);

    range = element.ownerDocument.createRange();
    t.initializeRange(element, range);
    t.insert(element, range.createContextualFragment(content.stripScripts()));

    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();
  $H({'id': 'id', 'className': 'class'}).each(function(pair) {
    var property = pair.first(), attribute = pair.last();
    var value = (element[property] || '').toString();
    if (value) result += ' ' + attribute + '=' + value.inspect(true);
  });
  return result + '>';
 },

 recursivelyCollect: function(element, property) {
  element = $(element);
  var elements = [];
  while (element = element[property])
    if (element.nodeType == 1)
      elements.push(Element.extend(element));
  return elements;
 },

 ancestors: function(element) {
  return $(element).recursivelyCollect('parentNode');
 },

 descendants: function(element) {
  return $A($(element).getElementsByTagName('*')).each(Element.extend);
 },

 firstDescendant: function(element) {
  element = $(element).firstChild;
  while (element && element.nodeType != 1) element = element.nextSibling;
  return $(element);
 },

 immediateDescendants: function(element) {
  if (!(element = $(element).firstChild)) return [];
  while (element && element.nodeType != 1) element = element.nextSibling;
  if (element) return [element].concat($(element).nextSiblings());
  return [];
 },

 previousSiblings: function(element) {
  return $(element).recursivelyCollect('previousSibling');
 },

 nextSiblings: function(element) {
  return $(element).recursivelyCollect('nextSibling');
 },

 siblings: function(element) {
  element = $(element);
  return element.previousSiblings().reverse().concat(element.nextSiblings());
 },

 match: function(element, selector) {
  if (Object.isString(selector))
    selector = new Selector(selector);
  return selector.match($(element));
 },

 up: function(element, expression, index) {
  element = $(element);
  if (arguments.length == 1) return $(element.parentNode);
  var ancestors = element.ancestors();
  return expression ? Selector.findElement(ancestors, expression, index) :
    ancestors[index || 0];
 },

 down: function(element, expression, index) {
  element = $(element);
  if (arguments.length == 1) return element.firstDescendant();
  var descendants = element.descendants();
  return expression ? Selector.findElement(descendants, expression, index) :
    descendants[index || 0];
 },

 previous: function(element, expression, index) {
  element = $(element);
  if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
  var previousSiblings = element.previousSiblings();
  return expression ? Selector.findElement(previousSiblings, expression, index) :
    previousSiblings[index || 0];
 },

 next: function(element, expression, index) {
  element = $(element);
  if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
  var nextSiblings = element.nextSiblings();
  return expression ? Selector.findElement(nextSiblings, expression, index) :
    nextSiblings[index || 0];
 },

 select: function() {
  var args = $A(arguments), element = $(args.shift());
  return Selector.findChildElements(element, args);
 },

 adjacent: function() {
  var args = $A(arguments), element = $(args.shift());
  return Selector.findChildElements(element.parentNode, args).without(element);
 },

 identify: function(element) {
  element = $(element);
  var id = element.readAttribute('id'), self = arguments.callee;
  if (id) return id;
  do { id = 'anonymous_element_' + self.counter++ } while ($(id));
  element.writeAttribute('id', id);
  return id;
 },

 readAttribute: function(element, name) {
  element = $(element);
  if (Prototype.Browser.IE) {
    var t = Element._attributeTranslations.read;
    if (t.values[name]) return t.values[name](element, name);
    if (t.names[name]) name = t.names[name];
    if (name.include(':')) {
      return (!element.attributes || !element.attributes[name]) ? null :
       element.attributes[name].value;
    }
  }
  return element.getAttribute(name);
 },

 writeAttribute: function(element, name, value) {
  element = $(element);
  var attributes = { }, t = Element._attributeTranslations.write;

  if (typeof name == 'object') attributes = name;
  else attributes[name] = value === undefined ? true : value;

  for (var attr in attributes) {
    var name = t.names[attr] || attr, value = attributes[attr];
    if (t.values[attr]) name = t.values[attr](element, value);
    if (value === false || value === null)
      element.removeAttribute(name);
    else if (value === true)
      element.setAttribute(name, name);
    else element.setAttribute(name, value);
  }
  return element;
 },

 getHeight: function(element) {
  return $(element).getDimensions().height;
 },

 getWidth: function(element) {
  return $(element).getDimensions().width;
 },

 classNames: function(element) {
  return new Element.ClassNames(element);
 },

 hasClassName: function(element, className) {
  if (!(element = $(element))) return;
  var elementClassName = element.className;
  return (elementClassName.length > 0 && (elementClassName == className ||
    new RegExp("(^|\\s)" + className + "(\\s|$)").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 = $(element))) return;
  element.className = element.className.replace(
    new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
  return element;
 },

 toggleClassName: function(element, className) {
  if (!(element = $(element))) return;
  return element[element.hasClassName(className) ?
    'removeClassName' : 'addClassName'](className);
 },

 // removes whitespace-only text node children
 cleanWhitespace: function(element) {
  element = $(element);
  var node = element.firstChild;
  while (node) {
    var nextNode = node.nextSibling;
    if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
      element.removeChild(node);
    node = nextNode;
  }
  return element;
 },

 empty: function(element) {
  return $(element).innerHTML.blank();
 },

 descendantOf: function(element, ancestor) {
  element = $(element), ancestor = $(ancestor);

  if (element.compareDocumentPosition)
    return (element.compareDocumentPosition(ancestor) & 8) === 8;

  if (element.sourceIndex && !Prototype.Browser.Opera) {
    var e = element.sourceIndex, a = ancestor.sourceIndex,
     nextAncestor = ancestor.nextSibling;
    if (!nextAncestor) {
      do { ancestor = ancestor.parentNode; }
      while (!(nextAncestor = ancestor.nextSibling) && ancestor.parentNode);
    }
    if (nextAncestor) return (e > a && e < nextAncestor.sourceIndex);
  }

  while (element = element.parentNode)
    if (element == ancestor) return true;
  return false;
 },

 scrollTo: function(element) {
  element = $(element);
  var pos = element.cumulativeOffset();
  window.scrollTo(pos[0], pos[1]);
  return element;
 },

 getStyle: function(element, style) {
  element = $(element);
  style = style == 'float' ? 'cssFloat' : style.camelize();
  var value = element.style[style];
  if (!value) {
    var css = document.defaultView.getComputedStyle(element, null);
    value = css ? css[style] : null;
  }
  if (style == 'opacity') return value ? parseFloat(value) : 1.0;
  return value == 'auto' ? null : value;
 },

 getOpacity: function(element) {
  return $(element).getStyle('opacity');
 },

 setStyle: function(element, styles) {
  element = $(element);
  var elementStyle = element.style, match;
  if (Object.isString(styles)) {
    element.style.cssText += ';' + styles;
    return styles.include('opacity') ?
      element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
  }
  for (var property in styles)
    if (property == 'opacity') element.setOpacity(styles[property]);
    else
      elementStyle[(property == 'float' || property == 'cssFloat') ?
        (elementStyle.styleFloat === undefined ? 'cssFloat' : 'styleFloat') :
          property] = styles[property];

  return element;
 },

 setOpacity: function(element, value) {
  element = $(element);
  element.style.opacity = (value == 1 || value === '') ? '' :
    (value < 0.00001) ? 0 : value;
  return element;
 },

 getDimensions: function(element) {
  element = $(element);
  var display = $(element).getStyle('display');
  if (display != 'none' && display != null) // Safari bug
    return {width: element.offsetWidth, height: element.offsetHeight};

  // 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 == 'relative' || p == 'absolute') 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 (!document.createRange || Prototype.Browser.Opera) {
 Element.Methods.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 t = Element._insertionTranslations, content, position, pos, tagName;

  for (position in insertions) {
    content  = insertions[position];
    position = position.toLowerCase();
    pos      = t[position];

    if (content && content.toElement) content = content.toElement();
    if (Object.isElement(content)) {
      pos.insert(element, content);
      continue;
    }

    content = Object.toHTML(content);
    tagName = ((position == 'before' || position == 'after')
      ? element.parentNode : element).tagName.toUpperCase();

    if (t.tags[tagName]) {
      var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
      if (position == 'top' || position == 'after') fragments.reverse();
      fragments.each(pos.insert.curry(element));
    }
    else element.insertAdjacentHTML(pos.adjacency, content.stripScripts());

    content.evalScripts.bind(content).defer();
  }

  return element;
 };
}

if (Prototype.Browser.Opera) {
 Element.Methods._getStyle = Element.Methods.getStyle;
 Element.Methods.getStyle = function(element, style) {
  switch(style) {
    case 'left':
    case 'top':
    case 'right':
    case 'bottom':
      if (Element._getStyle(element, 'position') == 'static') return null;
    default: return Element._getStyle(element, style);
  }
 };
 Element.Methods._readAttribute = Element.Methods.readAttribute;
 Element.Methods.readAttribute = function(element, attribute) {
  if (attribute == 'title') return element.title;
  return Element._readAttribute(element, attribute);
 };
}

else if (Prototype.Browser.IE) {
 $w('positionedOffset getOffsetParent 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);
      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) {
        var 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.clone(Element._attributeTranslations.read.names),
  values: {
    checked: function(element, value) {
      element.checked = !!value;
    },

    style: function(element, value) {
      element.style.cssText = value ? value : '';
    }
  }
 };

 Element._attributeTranslations.has = {};

 $w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
    'encType maxLength readOnly longDesc').each(function(attr) {
  Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
  Element._attributeTranslations.has[attr.toLowerCase()] = attr;
 });

 (function(v) {
  Object.extend(v, {
    href:        v._getAttr,
    src:         v._getAttr,
    type:        v._getAttr,
    action:      v._getAttrNode,
    disabled:    v._flag,
    checked:     v._flag,
    readonly:    v._flag,
    multiple:    v._flag,
    onload:      v._getEv,
    onunload:    v._getEv,
    onclick:     v._getEv,
    ondblclick:  v._getEv,
    onmousedown: v._getEv,
    onmouseup:   v._getEv,
    onmouseover: v._getEv,
    onmousemove: v._getEv,
    onmouseout:  v._getEv,
    onfocus:     v._getEv,
    onblur:      v._getEv,
    onkeypress:  v._getEv,
    onkeydown:   v._getEv,
    onkeyup:     v._getEv,
    onsubmit:    v._getEv,
    onreset:     v._getEv,
    onselect:    v._getEv,
    onchange:    v._getEv
  });
 })(Element._attributeTranslations.read.values);
}

else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
 Element.Methods.setOpacity = function(element, value) {
  element = $(element);
  element.style.opacity = (value == 1) ? 0.999999 :
    (value === '') ? '' : (value < 0.00001) ? 0 : value;
  return element;
 };
}

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 Position.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 (document.createElement('div').outerHTML) {
 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];
 div.innerHTML = t[0] + html + t[1];
 t[2].times(function() { div = div.firstChild });
 return $A(div.childNodes);
};

Element._insertionTranslations = {
 before: {
  adjacency: 'beforeBegin',
  insert: function(element, node) {
    element.parentNode.insertBefore(node, element);
  },
  initializeRange: function(element, range) {
    range.setStartBefore(element);
  }
 },
 top: {
  adjacency: 'afterBegin',
  insert: function(element, node) {
    element.insertBefore(node, element.firstChild);
  },
  initializeRange: function(element, range) {
    range.selectNodeContents(element);
    range.collapse(true);
  }
 },
 bottom: {
  adjacency: 'beforeEnd',
  insert: function(element, node) {
    element.appendChild(node);
  }
 },
 after: {
  adjacency: 'afterEnd',
  insert: function(element, node) {
    element.parentNode.insertBefore(node, element.nextSibling);
  },
  initializeRange: function(element, range) {
    range.setStartAfter(element);
  }
 },
 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() {
 this.bottom.initializeRange = this.top.initializeRange;
 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 = { };
  $w('width height').each(function(d) {
    var D = d.capitalize();
    dimensions[d] = self['inner' + D] ||
     (document.documentElement['client' + D] || document.body['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();
 },

 compileMatcher: function() {
  // Selectors with namespaced attributes can't use the XPath version
  if (Prototype.BrowserFeatures.XPath && !(/(\[[\w-]*?:|:checked)/).test(this.expression))
    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: "[@#{1}]",
  attr: function(m) {
    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}')]",
    '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
    '*=': "[contains(@#{1}, '#{3}')]",
    '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
    '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
  },
  pseudos: {
    'first-child': '[not(preceding-sibling::*)]',
    'last-child':  '[not(following-sibling::*)]',
    'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
    'empty':       "[count(*) = 0 and (count(text()) = 0 or translate(text(), ' \t\r\n', '') = '')]",
    'checked':     "[@checked]",
    'disabled':    "[@disabled]",
    'enabled':     "[not(@disabled)]",
    'not': function(m) {
      var e = m[6], p = Selector.patterns,
          x = Selector.xpath, le, m, v;

      var exclusion = [];
      while (e && le != e && (/\S/).test(e)) {
        le = e;
        for (var i in p) {
          if (m = e.match(p[i])) {
            v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
            exclusion.push("(" + v.substring(1, v.length - 1) + ")");
            e = e.replace(m[0], '');
            break;
          }
        }
      }
      return "[not(" + exclusion.join(" and ") + ")]";
    },
    'nth-child':      function(m) {
      return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
    },
    'nth-last-child': function(m) {
      return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
    },
    'nth-of-type':    function(m) {
      return Selector.xpath.pseudos.nth("position() ", m);
    },
    'nth-last-of-type': function(m) {
      return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
    },
    'first-of-type':  function(m) {
      m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
    },
    'last-of-type':   function(m) {
      m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
    },
    'only-of-type':   function(m) {
      var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
    },
    nth: function(fragment, m) {
      var mm, formula = m[6], predicate;
      if (formula == 'even') formula = '2n+0';
      if (formula == 'odd')  formula = '2n+1';
      if (mm = formula.match(/^(\d+)$/)) // 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 = false;',
  attr: function(m) {
    m[3] = (m[5] || m[6]);
    return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}"); 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|$)?/,
  id:           /^#([\w\-\*]+)(\b|$)/,
  className:    /^\.([\w\-\*]+)(\b|$)/,
  pseudo:       /^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s)|(?=:))/,
  attrPresence: /^\[([\w]+)\]/,
  attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
 },

 // for Selector.match and Element#match
 assertions: {
  tagName: function(element, matches) {
    return matches[1].toUpperCase() == element.tagName.toUpperCase();
  },

  className: function(element, matches) {
    return Element.hasClassName(element, matches[1]);
  },

  id: function(element, matches) {
    return element.id === matches[1];
  },

  attrPresence: function(element, matches) {
    return Element.hasAttribute(element, matches[1]);
  },

  attr: function(element, matches) {
    var nodeValue = Element.readAttribute(element, matches[1]);
    return Selector.operators[matches[2]](nodeValue, matches[3]);
  }
 },

 handlers: {
  // UTILITY FUNCTIONS
  // joins two collections
  concat: function(a, b) {
    for (var i = 0, node; node = b[i]; i++)
      a.push(node);
    return a;
  },

  // marks an array of nodes for counting
  mark: function(nodes) {
    for (var i = 0, node; node = nodes[i]; i++)
      node._counted = true;
    return nodes;
  },

  unmark: function(nodes) {
    for (var i = 0, node; node = nodes[i]; i++)
      node._counted = undefined;
    return nodes;
  },

  // mark each child node with its position (for nth calls)
  // "ofType" flag indicates whether we're indexing for nth-of-type
  // rather than nth-child
  index: function(parentNode, reverse, ofType) {
    parentNode._counted = true;
    if (reverse) {
      for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
        var node = nodes[i];
        if (node.nodeType == 1 && (!ofType || node._counted)) node.nodeIndex = j++;
      }
    } else {
      for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
        if (node.nodeType == 1 && (!ofType || node._counted)) node.nodeIndex = j++;
    }
  },

  // filters out duplicates and extends all nodes
  unique: function(nodes) {
    if (nodes.length == 0) return nodes;
    var results = [], n;
    for (var i = 0, l = nodes.length; i < l; i++)
      if (!(n = nodes[i])._counted) {
        n._counted = true;
        results.push(Element.extend(n));
      }
    return Selector.handlers.unmark(results);
  },

  // COMBINATOR FUNCTIONS
  descendant: function(nodes) {
    var h = Selector.handlers;
    for (var i = 0, results = [], node; node = nodes[i]; i++)
      h.concat(results, node.getElementsByTagName('*'));
    return results;
  },

  child: function(nodes) {
    var h = Selector.handlers;
    for (var i = 0, results = [], node; node = nodes[i]; i++) {
      for (var j = 0, children = [], child; child = node.childNodes[j]; j++)
        if (child.nodeType == 1 && child.tagName != '!') results.push(child);
    }
    return results;
  },

  adjacent: function(nodes) {
    for (var i = 0, results = [], node; node = nodes[i]; i++) {
      var next = this.nextElementSibling(node);
      if (next) results.push(next);
    }
    return results;
  },

  laterSibling: function(nodes) {
    var h = Selector.handlers;
    for (var i = 0, results = [], node; node = nodes[i]; i++)
      h.concat(results, Element.nextSiblings(node));
    return results;
  },

  nextElementSibling: function(node) {
    while (node = node.nextSibling)
             if (node.nodeType == 1) return node;
    return null;
  },

  previousElementSibling: function(node) {
    while (node = node.previousSibling)
      if (node.nodeType == 1) return node;
    return null;
  },

  // TOKEN FUNCTIONS
  tagName: function(nodes, root, tagName, combinator) {
    tagName = tagName.toUpperCase();
    var results = [], h = Selector.handlers;
    if (nodes) {
      if (combinator) {
        // fastlane for ordinary descendant combinators
        if (combinator == "descendant") {
          for (var i = 0, node; node = nodes[i]; i++)
            h.concat(results, node.getElementsByTagName(tagName));
          return results;
        } else nodes = this[combinator](nodes);
        if (tagName == "*") return nodes;
      }
      for (var i = 0, node; node = nodes[i]; i++)
        if (node.tagName.toUpperCase() == tagName) results.push(node);
      return results;
    } else return root.getElementsByTagName(tagName);
  },

  id: function(nodes, root, id, combinator) {
    var targetNode = $(id), h = Selector.handlers;
    if (!targetNode) return [];
    if (!nodes && root == document) return [targetNode];
    if (nodes) {
      if (combinator) {
        if (combinator == 'child') {
          for (var i = 0, node; node = nodes[i]; i++)
            if (targetNode.parentNode == node) return [targetNode];
        } else if (combinator == 'descendant') {
          for (var i = 0, node; node = nodes[i]; i++)
            if (Element.descendantOf(targetNode, node)) return [targetNode];
        } else if (combinator == 'adjacent') {
          for (var i = 0, node; node = nodes[i]; i++)
            if (Selector.handlers.previousElementSibling(targetNode) == node)
              return [targetNode];
        } else nodes = h[combinator](nodes);
      }
      for (var i = 0, node; node = nodes[i]; i++)
        if (node == targetNode) return [targetNode];
      return [];
    }
    return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
  },

  className: function(nodes, root, className, combinator) {
    if (nodes && combinator) nodes = this[combinator](nodes);
    return Selector.handlers.byClassName(nodes, root, className);
  },

  byClassName: function(nodes, root, className) {
    if (!nodes) nodes = Selector.handlers.descendant([root]);
    var needle = ' ' + className + ' ';
    for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
      nodeClassName = node.className;
      if (nodeClassName.length == 0) continue;
      if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
        results.push(node);
    }
    return results;
  },

  attrPresence: function(nodes, root, attr) {
    if (!nodes) nodes = root.getElementsByTagName("*");
    var results = [];
    for (var i = 0, node; node = nodes[i]; i++)
      if (Element.hasAttribute(node, attr)) results.push(node);
    return results;
  },

  attr: function(nodes, root, attr, value, operator) {
    if (!nodes) nodes = root.getElementsByTagName("*");
    var handler = Selector.operators[operator], results = [];
    for (var i = 0, node; node = nodes[i]; i++) {
      var nodeValue = Element.readAttribute(node, attr);
      if (nodeValue === null) continue;
      if (handler(nodeValue, value)) results.push(node);
    }
    return results;
  },

  pseudo: function(nodes, name, value, root, combinator) {
    if (nodes && combinator) nodes = this[combinator](nodes);
    if (!nodes) nodes = root.getElementsByTagName("*");
    return Selector.pseudos[name](nodes, value, root);
  }
 },

 pseudos: {
  'first-child': function(nodes, value, root) {
    for (var i = 0, results = [], node; node = nodes[i]; i++) {
      if (Selector.handlers.previousElementSibling(node)) continue;
        results.push(node);
    }
    return results;
  },
  'last-child': function(nodes, value, root) {
    for (var i = 0, results = [], node; node = nodes[i]; i++) {
      if (Selector.handlers.nextElementSibling(node)) continue;
        results.push(node);
    }
    return results;
  },
  'only-child': function(nodes, value, root) {
    var h = Selector.handlers;
    for (var i = 0, results = [], node; node = nodes[i]; i++)
      if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
        results.push(node);
    return results;
  },
  'nth-child':        function(nodes, formula, root) {
    return Selector.pseudos.nth(nodes, formula, root);
  },
  'nth-last-child':   function(nodes, formula, root) {
    return Selector.pseudos.nth(nodes, formula, root, true);
  },
  'nth-of-type':      function(nodes, formula, root) {
    return Selector.pseudos.nth(nodes, formula, root, false, true);
  },
  'nth-last-of-type': function(nodes, formula, root) {
    return Selector.pseudos.nth(nodes, formula, root, true, true);
  },
  'first-of-type':    function(nodes, formula, root) {
    return Selector.pseudos.nth(nodes, "1", root, false, true);
  },
  'last-of-type':     function(nodes, formula, root) {
    return Selector.pseudos.nth(nodes, "1", root, true, true);
  },
  'only-of-type':     function(nodes, formula, root) {
    var p = Selector.pseudos;
    return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
  },

  // handles the an+b logic
  getIndices: function(a, b, total) {
    if (a == 0) return b > 0 ? [b] : [];
    return $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._counted) {
        h.index(node.parentNode, reverse, ofType);
        indexed.push(node.parentNode);
      }
    }
    if (formula.match(/^\d+$/)) { // just a number
      formula = Number(formula);
      for (var i = 0, node; node = nodes[i]; i++)
        if (node.nodeIndex == formula) results.push(node);
    } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
      if (m[1] == "-") m[1] = -1;
      var a = m[1] ? Number(m[1]) : 1;
      var b = m[2] ? Number(m[2]) : 0;
      var indices = Selector.pseudos.getIndices(a, b, nodes.length);
      for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
        for (var j = 0; j < l; j++)
          if (node.nodeIndex == indices[j]) results.push(node);
      }
    }
    h.unmark(nodes);
    h.unmark(indexed);
    return results;
  },

  'empty': function(nodes, value, root) {
    for (var i = 0, results = [], node; node = nodes[i]; i++) {
      // IE treats comments as element nodes
      if (node.tagName == '!' || (node.firstChild && !node.innerHTML.match(/^\s*$/))) 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._counted) 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); },
  '$=': function(nv, v) { return nv.endsWith(v); },
  '*=': function(nv, v) { return nv.include(v); },
  '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
  '|=': function(nv, v) { return ('-' + nv.toUpperCase() + '-').include('-' + v.toUpperCase() + '-'); }
 },

 matchElements: function(elements, expression) {
  var matches = new Selector(expression).findElements(), h = Selector.handlers;
  h.mark(matches);
  for (var i = 0, results = [], element; element = elements[i]; i++)
    if (element._counted) 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) {
  var exprs = expressions.join(','), expressions = [];
  exprs.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
    expressions.push(m[1].strip());
  });
  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;
 }
});

function $$() {
 return Selector.findChildElements(document, $A(arguments));
}
var Form = {
 reset: function(form) {
  $(form).reset();
  return form;
 },

 serializeElements: function(elements, options) {
  if (typeof options != 'object') options = { hash: !!options };
  else if (options.hash === undefined) 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 $A(inputs).map(Element.extend);

  for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
    var input = inputs[i];
    if ((typeName && input.type != typeName) || (name && input.name != name))
      continue;
    matchingInputs.push(Element.extend(input));
  }

  return matchingInputs;
 },

 disable: function(form) {
  form = $(form);
  Form.getElements(form).invoke('disable');
  return form;
 },

 enable: function(form) {
  form = $(form);
  Form.getElements(form).invoke('enable');
  return form;
 },

 findFirstElement: function(form) {
  var elements = $(form).getElements().findAll(function(element) {
    return 'hidden' != element.type && !element.disabled;
  });
  var firstByIndex = elements.findAll(function(element) {
    return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
  }).sortBy(function(element) { return element.tabIndex }).first();

  return firstByIndex ? firstByIndex : elements.find(function(element) {
    return ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
  });
 },

 focusFirstElement: function(form) {
  form = $(form);
  form.findFirstElement().activate();
  return form;
 },

 request: function(form, options) {
  form = $(form), options = Object.clone(options || { });

  var params = options.parameters, action = form.readAttribute('action') || '';
  if (action.blank()) action = window.location.href;
  options.parameters = form.serialize(true);

  if (params) {
    if (Object.isString(params)) params = params.toQueryParams();
    Object.extend(options.parameters, params);
  }

  if (form.hasAttribute('method') && !options.method)
    options.method = form.method;

  return new Ajax.Request(action, options);
 }
};

/*--------------------------------------------------------------------------*/

Form.Element = {
 focus: function(element) {
  $(element).focus();
  return element;
 },

 select: function(element) {
  $(element).select();
  return element;
 }
};

Form.Element.Methods = {
 serialize: function(element) {
  element = $(element);
  if (!element.disabled && element.name) {
    var value = element.getValue();
    if (value != undefined) {
      var pair = { };
      pair[element.name] = value;
      return Object.toQueryString(pair);
    }
  }
  return '';
 },

 getValue: function(element) {
  element = $(element);
  var method = element.tagName.toLowerCase();
  return Form.Element.Serializers[method](element);
 },

 setValue: function(element, value) {
  element = $(element);
  var method = element.tagName.toLowerCase();
  Form.Element.Serializers[method](element, value);
  return element;
 },

 clear: function(element) {
  $(element).value = '';
  return element;
 },

 present: function(element) {
  return $(element).value != '';
 },

 activate: function(element) {
  element = $(element);
  try {
    element.focus();
    if (element.select && (element.tagName.toLowerCase() != 'input' ||
        !['button', 'reset', 'submit'].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 (value === undefined) return element.checked ? element.value : null;
  else element.checked = !!value;
 },

 textarea: function(element, value) {
  if (value === undefined) return element.value;
  else element.value = value;
 },

 select: function(element, index) {
  if (index === undefined)
    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);
    return element.match(expression) ? element : element.up(expression);
  },

  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._eventID) return element._eventID;
  arguments.callee.id = arguments.callee.id || 1;
  return element._eventID = ++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;

    if (document.createEvent) {
      var event = document.createEvent("HTMLEvents");
      event.initEvent("dataavailable", true, true);
    } else {
      var 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;
  }
 };
})());

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()
});

(function() {
 /* Support for the DOMContentLoaded event is based on work by Dan Webb,
   Matthias Miller, Dean Edwards and John Resig. */

 var timer, fired = false;

 function fireContentLoadedEvent() {
  if (fired) return;
  if (timer) window.clearInterval(timer);
  document.fire("dom:loaded");
  fired = 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('"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('') : iter(className);
  return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
 } : function(element, className) {
  className = className.toString().strip();
  var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
  if (!classNames && !className) return elements;

  var nodes = $(element).getElementsByTagName('*');
  className = ' ' + className + ' ';

  for (var i = 0, child, cn; child = nodes[i]; i++) {
    if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
        (classNames && classNames.all(function(name) {
          return !name.toString().blank() && cn.include(' ' + name + ' ');
        }))))
      elements.push(Element.extend(child));
  }
  return elements;
 };

 return function(className, parentElement) {
  return $(parentElement || document.body).getElementsByClassName(className);
 };
}(Element.Methods);

/*--------------------------------------------------------------------------*/

Element.ClassNames = Class.create();
Element.ClassNames.prototype = {
 initialize: function(element) {
  this.element = $(element);
 },

 _each: function(iterator) {
  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(' '));
 },

 remove: function(classNameToRemove) {
  if (!this.include(classNameToRemove)) return;
  this.set($A(this).without(classNameToRemove).join(' '));
 },

 toString: function() {
  return $A(this).join(' ');
 }
};

Object.extend(Element.ClassNames.prototype, Enumerable);

/*--------------------------------------------------------------------------*/

Element.addMethods();