From: <mako@atdot.cc>
Date: Fri, 14 Sep 2007 13:37:03 +0000 (-0400)
Subject: added much of the ruler application
X-Git-Url: https://projects.mako.cc/source/yourule/commitdiff_plain/769e51f5d2f06c6e40a09378b9c127d21d65c8f5?hp=9ba5d300368cf7b4f7c49cfce16880eb92f0f8b9

added much of the ruler application
---

diff --git a/SVGdraw.py b/SVGdraw.py
old mode 100755
new mode 100644
diff --git a/ruler.py b/ruler.py
new file mode 100644
index 0000000..39bcd3d
--- /dev/null
+++ b/ruler.py
@@ -0,0 +1,78 @@
+# define the length of things
+from __future__ import division
+import SVGdraw
+
+class Ruler:
+    def __init__(self, scale=None, units=None,
+                 ruler_height=None, ruler_length=None):
+
+        # default values come from OLPC
+        self.scale = scale or 78.740
+        self.units = units or 'centimeters'
+        self.ruler_height = ruler_height or 200
+        self.ruler_length = ruler_length or 15
+
+        font_height = 22
+
+        self.drawing = SVGdraw.drawing()
+        self.svg = SVGdraw.svg()
+
+        # create the body of the ruler
+        body = SVGdraw.rect(0, 0, 
+                            (self.scale * self.ruler_length),
+                            self.ruler_height, "white", "black", 2) 
+        self.svg.addElement(body)
+
+        # add a units label
+        units = SVGdraw.text((self.scale / 2),
+                             (self.ruler_height - self.scale / 5),
+                             self.units, font_height)
+        self.svg.addElement(units)
+
+        self.point = 0.0
+
+
+        # find the appropriate subunit marker
+        self.subunit_marks = 1
+
+        while self.scale / self.subunit_marks >= font_height * 3:
+            if self.subunit_marks == 1:
+                self.subunit_marks += 3
+            else:
+                self.subunit_marks = self.subunit_marks * 2
+
+        # for every unit 
+        for i in range(self.ruler_length):
+
+            # place subunit marks
+            for i2 in range(self.subunit_marks):
+                self.__drawline(0.3)
+            
+            self.__drawline(0.6)
+            self.svg.addElement(SVGdraw.text((self.point - font_height * 1.4),
+                           (self.ruler_height * 0.6 - 5),
+                            str(i + 1), font_height))
+    
+
+        self.drawing.setSVG(self.svg)
+
+    def output(self):
+        import cStringIO
+        xml = cStringIO.StringIO()
+        xml.write("<?xml version='1.0' encoding='UTF-8'?>\n")
+        xml.write("<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.0//EN\" \"http://www .w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd \">\n")      
+        self.svg.toXml(0,xml)
+
+        return(xml.getvalue())
+
+    def write_svg_to_file(self, filename='output.svg'):
+        self.drawing.toXml(filename)
+
+    def __drawline(self, size):
+        
+        self.point = self.point + (self.scale / (1 + self.subunit_marks))
+        line = SVGdraw.line(self.point, 0, self.point,
+                            (self.ruler_height * size), "black", 2)
+        self.svg.addElement(line)
+
+
diff --git a/ruler_gallery_db.sql b/ruler_gallery_db.sql
new file mode 100644
index 0000000..c151702
--- /dev/null
+++ b/ruler_gallery_db.sql
@@ -0,0 +1,9 @@
+CREATE TABLE gallery (
+  id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+  pixel_width REAL NOT NULL,
+  unit_width REAL NOT NULL,
+  units VARCHAR(100) NOT NULL,
+  model VARCHAR(255) NOT NULL
+);
+
+
diff --git a/ruler_in.py b/ruler_in.py
deleted file mode 100755
index da8c819..0000000
--- a/ruler_in.py
+++ /dev/null
@@ -1,42 +0,0 @@
-#!/usr/bin/env python
-
-# define the length of things
-scale = 7.8740
-ruler_height = 200 # in px
-ruler_length = 15 # in cm
-
-import SVGdraw
-
-drawing = SVGdraw.drawing()
-svg = SVGdraw.svg()
-
-# create the body of the ruler
-body = SVGdraw.rect(0, 0, (10 * scale * ruler_length), ruler_height, "white", "black", 2) 
-svg.addElement(body)
-
-# add a units label
-units = SVGdraw.text((scale * 5), (ruler_height - scale * 2), "centimeters", 24)
-svg.addElement(units)
-
-point = 0.0
-def drawline(size):
-    global point
-    point = point + (2 * scale)
-    line = SVGdraw.line(point, 0, point, (ruler_height * size), "black", 2)
-    svg.addElement(line)
-
-# for every centimeter
-for i in range(ruler_length):
-
-    # place 2mm marks
-    for i2 in range(4):
-        drawline(0.3)
-    
-    drawline(0.6)
-    svg.addElement(SVGdraw.text((point - 36), (ruler_height * 0.6 - 5),
-                                str(i + 1), 24))
-
-drawing.setSVG(svg)
-drawing.toXml('ruler_cm.svg')
-
-
diff --git a/ruler_web.py b/ruler_web.py
new file mode 100755
index 0000000..2738f8f
--- /dev/null
+++ b/ruler_web.py
@@ -0,0 +1,163 @@
+#!/usr/bin/env python
+
+from __future__ import division
+import web
+import sys, os, re
+from storm.locals import *
+from ruler import RulerImage
+
+# the url map for the application
+urls = ( '/', 'index',
+         '/ruler_([0-9\.]+)px_([0-9\.]+)([A-Za-z]+).(svg|png|jpg)', 'ruler_img',
+         '/show/(.*(svg|png|jpg))', 'ruler',
+         '/gallery(.*)', 'gallery',
+         '/delete/(\d+)', 'delete',
+         '/undelete/(\d+)', 'undelete')
+
+database = create_database("sqlite:ruler_web.db")
+store = Store(database)
+
+class SavedRuler(object):
+    __storm_table__ = "gallery"
+    id = Int(primary=True)
+    pixel_width = Float()
+    unit_width = Float()
+    model = Unicode()
+    units = Unicode()
+    show = Int()
+
+    def __init__(self, **kw):
+        self.pixel_width = kw['pixel_width']
+        self.unit_width = kw['unit_width']
+        self.units = kw['units']
+        self.model = kw['model']
+
+    def cm_width(self):
+        if self.units == 'centimeters':
+            return self.unit_width
+        elif self.units == 'inches':
+            return(self.unit_width * 2.54)
+
+    def in_width(self):
+        if self.units == 'inches':
+            return self.unit_width
+        elif self.units == 'centimeters':
+            return(self.unit_width * 0.3937)
+
+
+class index:
+    def GET(self):
+        web.header("Content-Type","text/html; charset=utf-8")
+        web.render('index.tmpl')
+
+    def POST(self):
+        input = web.input()
+
+        pixel_width = input['pixel_width']
+        unit_width = input['unit_width']
+        units = input['units']
+        ruler_url = 'ruler_%spx_%s%s.png' % (pixel_width, unit_width, units)
+        web.redirect('/show/%s' % ruler_url)
+
+class ruler:
+    def GET(self, ruler_url, ext):
+        web.debug('test test')
+        if web.input().has_key('fromgallery'):
+            fromgallery = True
+        else:
+            fromgallery = False
+
+        other_unit, other_unit_url = get_other_units(ruler_url)
+
+        web.header("Content-Type","text/html; charset=utf-8")
+        web.render('show_ruler.tmpl')
+
+
+class ruler_img:
+    def GET(self, pixel_width=None, unit_width=None, units=None, ext=None):
+
+        # TODO check to see if it's a format that we support
+
+        # set ruler height to be 200 px always
+        pixel_width = float(pixel_width)
+        unit_width = float(unit_width)
+
+        ruler_height = 200
+
+        scale = pixel_width / unit_width
+        ruler_length = int(unit_width)
+
+        ruler = Ruler(scale, units, ruler_height, ruler_length)
+
+        # print the header
+        if ext == 'svg': ext = 'svg+xml'
+        web.header("Content-Type", "image/%s" % ext)
+
+        if ext == 'svg+xml':
+            sys.stdout.write(ruler.output())
+        else:
+            pin, pout = os.popen2('convert -size %sx%s - %s:-' % \
+                                  (pixel_width, ruler_height, ext))
+
+            pin.write(ruler.output())
+            pin.close()
+            sys.stdout.write(pout.read())
+
+class gallery:
+    def GET(self, ruler_url):
+
+        if ruler_url:
+            pixel_width, unit_width, units = process_ruler_url(ruler_url)[0:3]
+
+        rulers = store.find(SavedRuler, SavedRuler.show == 1)
+        rulers.order_by(SavedRuler.model)
+
+        web.render('gallery.tmpl')
+
+    def POST(self):
+        input = web.input()
+
+        new_ruler = SavedRuler(pixel_width=float(input['pixel_width']),
+                               unit_width=float(input['unit_width']),
+                               units=unicode(input['units']),
+                               model=unicode(input['model']))
+
+        store.add(new_ruler)
+        store.commit()
+
+        web.redirect('gallery')
+
+class delete:
+    def GET(self, id):
+        ruler = store.get(SavedRuler, int(id))
+        ruler.show = 0
+        store.commit()
+        web.redirect('/gallery')
+
+
+class undelete:
+    def GET(self, id):
+        ruler = store.get(SavedRuler, int(id))
+        ruler.show = 1
+        store.commit()
+        web.redirect('/gallery')
+
+def get_other_units(url):
+    pixel_width, unit_width, units = process_ruler_url(url)[0:3]
+    ruler = SavedRuler(pixel_width=float(pixel_width),
+                       unit_width=float(unit_width),
+                       units=unicode(units),
+                       model=unicode(model))
+
+def process_ruler_url(url):
+    url = re.sub(r'^/?(ruler.*)$', r'\1', url)
+    return(re.match( r'ruler_([\d\.]+)px_([\d\.]+)(\w+).(png|svg|jpg)',
+           url).groups())
+
+# render the site template here so that i can use it later
+web.render('site.tmpl', None, True, 'site')
+
+web.webapi.internalerror = web.debugerror
+if __name__ == "__main__":
+    web.run(urls, globals(), web.reloader)
+
diff --git a/rulers_cm.py b/rulers_cm.py
deleted file mode 100755
index da8c819..0000000
--- a/rulers_cm.py
+++ /dev/null
@@ -1,42 +0,0 @@
-#!/usr/bin/env python
-
-# define the length of things
-scale = 7.8740
-ruler_height = 200 # in px
-ruler_length = 15 # in cm
-
-import SVGdraw
-
-drawing = SVGdraw.drawing()
-svg = SVGdraw.svg()
-
-# create the body of the ruler
-body = SVGdraw.rect(0, 0, (10 * scale * ruler_length), ruler_height, "white", "black", 2) 
-svg.addElement(body)
-
-# add a units label
-units = SVGdraw.text((scale * 5), (ruler_height - scale * 2), "centimeters", 24)
-svg.addElement(units)
-
-point = 0.0
-def drawline(size):
-    global point
-    point = point + (2 * scale)
-    line = SVGdraw.line(point, 0, point, (ruler_height * size), "black", 2)
-    svg.addElement(line)
-
-# for every centimeter
-for i in range(ruler_length):
-
-    # place 2mm marks
-    for i2 in range(4):
-        drawline(0.3)
-    
-    drawline(0.6)
-    svg.addElement(SVGdraw.text((point - 36), (ruler_height * 0.6 - 5),
-                                str(i + 1), 24))
-
-drawing.setSVG(svg)
-drawing.toXml('ruler_cm.svg')
-
-
diff --git a/static/images/trash.png b/static/images/trash.png
new file mode 100644
index 0000000..0e0953c
Binary files /dev/null and b/static/images/trash.png differ
diff --git a/static/prototype.js b/static/prototype.js
new file mode 100644
index 0000000..1beb8a8
--- /dev/null
+++ b/static/prototype.js
@@ -0,0 +1,3271 @@
+/*  Prototype JavaScript framework, version 1.5.1_rc4
+ *  (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: '1.5.1_rc4',
+
+  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
+  },
+
+  BrowserFeatures: {
+    XPath: !!document.evaluate,
+    ElementExtensions: !!window.HTMLElement,
+    SpecificElementExtensions:
+      (document.createElement('div').__proto__ !==
+       document.createElement('form').__proto__)
+  },
+
+  ScriptFragment: '<script[^>]*>([\u0001-\uFFFF]*?)</script>',
+  JSONFilter: /^\/\*-secure-\s*(.*)\s*\*\/\s*$/,
+
+  emptyFunction: function() { },
+  K: function(x) { return x }
+}
+
+var Class = {
+  create: function() {
+    return function() {
+      this.initialize.apply(this, arguments);
+    }
+  }
+}
+
+var Abstract = new Object();
+
+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.ownerDocument === document) 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(', ') + '}';
+  },
+
+  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);
+  }
+});
+
+Function.prototype.bind = function() {
+  var __method = this, args = $A(arguments), object = args.shift();
+  return function() {
+    return __method.apply(object, args.concat($A(arguments)));
+  }
+}
+
+Function.prototype.bindAsEventListener = function(object) {
+  var __method = this, args = $A(arguments), object = args.shift();
+  return function(event) {
+    return __method.apply(object, [( event || window.event)].concat(args).concat($A(arguments)));
+  }
+}
+
+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';
+  }
+});
+
+Date.prototype.toJSON = function() {
+  return '"' + this.getFullYear() + '-' +
+    (this.getMonth() + 1).toPaddedString(2) + '-' +
+    this.getDate().toPaddedString(2) + 'T' +
+    this.getHours().toPaddedString(2) + ':' +
+    this.getMinutes().toPaddedString(2) + ':' +
+    this.getSeconds().toPaddedString(2) + '"';
+};
+
+var Try = {
+  these: function() {
+    var returnValue;
+
+    for (var i = 0, length = arguments.length; i < length; i++) {
+      var lambda = arguments[i];
+      try {
+        returnValue = lambda();
+        break;
+      } catch (e) {}
+    }
+
+    return returnValue;
+  }
+}
+
+/*--------------------------------------------------------------------------*/
+
+var PeriodicalExecuter = Class.create();
+PeriodicalExecuter.prototype = {
+  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);
+  },
+
+  stop: function() {
+    if (!this.timer) return;
+    clearInterval(this.timer);
+    this.timer = null;
+  },
+
+  onTimerEvent: function() {
+    if (!this.currentlyExecuting) {
+      try {
+        this.currentlyExecuting = true;
+        this.callback(this);
+      } 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 this;
+  },
+
+  truncate: function(length, truncation) {
+    length = length || 30;
+    truncation = truncation === undefined ? '...' : truncation;
+    return this.length > length ?
+      this.slice(0, length - truncation.length) + truncation : 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 = document.createElement('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 (hash[key].constructor != Array) 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) {
+    var result = '';
+    for (var i = 0; i < count; i++) result += this;
+    return result;
+  },
+
+  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}');
+  },
+
+  evalJSON: function(sanitize) {
+    var json = this.unfilterJSON();
+    try {
+      if (!sanitize || (/^("(\\.|[^"\\\n\r])*?"|[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t])+?$/.test(json)))
+        return eval('(' + json + ')');
+    } catch (e) { }
+    throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
+  },
+
+  include: function(pattern) {
+    return this.indexOf(pattern) > -1;
+  },
+
+  startsWith: function(pattern) {
+    return this.indexOf(pattern) === 0;
+  },
+
+  endsWith: function(pattern) {
+    var d = this.length - pattern.length;
+    return d >= 0 && this.lastIndexOf(pattern) === d;
+  },
+
+  empty: function() {
+    return this == '';
+  },
+
+  blank: function() {
+    return /^\s*$/.test(this);
+  }
+});
+
+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 (typeof replacement == 'function') 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();
+Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
+Template.prototype = {
+  initialize: function(template, pattern) {
+    this.template = template.toString();
+    this.pattern  = pattern || Template.Pattern;
+  },
+
+  evaluate: function(object) {
+    return this.template.gsub(this.pattern, function(match) {
+      var before = match[1];
+      if (before == '\\') return match[2];
+      return before + String.interpret(object[match[3]]);
+    });
+  }
+}
+
+var $break = {}, $continue = new Error('"throw $continue" is deprecated, use "return" instead');
+
+var Enumerable = {
+  each: function(iterator) {
+    var index = 0;
+    try {
+      this._each(function(value) {
+        iterator(value, index++);
+      });
+    } catch (e) {
+      if (e != $break) throw e;
+    }
+    return this;
+  },
+
+  eachSlice: function(number, iterator) {
+    var index = -number, slices = [], array = this.toArray();
+    while ((index += number) < array.length)
+      slices.push(array.slice(index, index+number));
+    return slices.map(iterator);
+  },
+
+  all: function(iterator) {
+    var result = true;
+    this.each(function(value, index) {
+      result = result && !!(iterator || Prototype.K)(value, index);
+      if (!result) throw $break;
+    });
+    return result;
+  },
+
+  any: function(iterator) {
+    var result = false;
+    this.each(function(value, index) {
+      if (result = !!(iterator || Prototype.K)(value, index))
+        throw $break;
+    });
+    return result;
+  },
+
+  collect: function(iterator) {
+    var results = [];
+    this.each(function(value, index) {
+      results.push((iterator || Prototype.K)(value, index));
+    });
+    return results;
+  },
+
+  detect: function(iterator) {
+    var result;
+    this.each(function(value, index) {
+      if (iterator(value, index)) {
+        result = value;
+        throw $break;
+      }
+    });
+    return result;
+  },
+
+  findAll: function(iterator) {
+    var results = [];
+    this.each(function(value, index) {
+      if (iterator(value, index))
+        results.push(value);
+    });
+    return results;
+  },
+
+  grep: function(pattern, iterator) {
+    var results = [];
+    this.each(function(value, index) {
+      var stringValue = value.toString();
+      if (stringValue.match(pattern))
+        results.push((iterator || Prototype.K)(value, index));
+    })
+    return results;
+  },
+
+  include: function(object) {
+    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) {
+    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) {
+    var result;
+    this.each(function(value, index) {
+      value = (iterator || Prototype.K)(value, index);
+      if (result == undefined || value >= result)
+        result = value;
+    });
+    return result;
+  },
+
+  min: function(iterator) {
+    var result;
+    this.each(function(value, index) {
+      value = (iterator || Prototype.K)(value, index);
+      if (result == undefined || value < result)
+        result = value;
+    });
+    return result;
+  },
+
+  partition: function(iterator) {
+    var trues = [], falses = [];
+    this.each(function(value, index) {
+      ((iterator || Prototype.K)(value, index) ?
+        trues : falses).push(value);
+    });
+    return [trues, falses];
+  },
+
+  pluck: function(property) {
+    var results = [];
+    this.each(function(value, index) {
+      results.push(value[property]);
+    });
+    return results;
+  },
+
+  reject: function(iterator) {
+    var results = [];
+    this.each(function(value, index) {
+      if (!iterator(value, index))
+        results.push(value);
+    });
+    return results;
+  },
+
+  sortBy: function(iterator) {
+    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 = $A(arguments);
+    if (typeof args.last() == 'function')
+      iterator = args.pop();
+
+    var collections = [this].concat(args).map($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,
+  member:  Enumerable.include,
+  entries: Enumerable.toArray
+});
+var $A = Array.from = function(iterable) {
+  if (!iterable) return [];
+  if (iterable.toArray) {
+    return iterable.toArray();
+  } else {
+    var results = [];
+    for (var i = 0, length = iterable.length; i < length; i++)
+      results.push(iterable[i]);
+    return results;
+  }
+}
+
+if (Prototype.Browser.WebKit) {
+  $A = Array.from = function(iterable) {
+    if (!iterable) return [];
+    if (!(typeof iterable == 'function' && iterable == '[object NodeList]') &&
+      iterable.toArray) {
+      return iterable.toArray();
+    } else {
+      var results = [];
+      for (var i = 0, length = iterable.length; i < length; i++)
+        results.push(iterable[i]);
+      return results;
+    }
+  }
+}
+
+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(value && value.constructor == Array ?
+        value.flatten() : [value]);
+    });
+  },
+
+  without: function() {
+    var values = $A(arguments);
+    return this.select(function(value) {
+      return !values.include(value);
+    });
+  },
+
+  indexOf: function(object) {
+    for (var i = 0, length = this.length; i < length; i++)
+      if (this[i] == object) return i;
+    return -1;
+  },
+
+  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;
+    });
+  },
+
+  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(', ') + ']';
+  }
+});
+
+Array.prototype.toArray = Array.prototype.clone;
+
+function $w(string) {
+  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 (arguments[i].constructor == Array) {
+        for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
+          array.push(arguments[i][j]);
+      } else {
+        array.push(arguments[i]);
+      }
+    }
+    return array;
+  }
+}
+var Hash = function(object) {
+  if (object instanceof Hash) this.merge(object);
+  else Object.extend(this, object || {});
+};
+
+Object.extend(Hash, {
+  toQueryString: function(obj) {
+    var parts = [];
+    parts.add = arguments.callee.addPair;
+
+    this.prototype._each.call(obj, function(pair) {
+      if (!pair.key) return;
+      var value = pair.value;
+
+      if (value && typeof value == 'object') {
+        if (value.constructor == Array) value.each(function(value) {
+          parts.add(pair.key, value);
+        });
+        return;
+      }
+      parts.add(pair.key, value);
+    });
+
+    return parts.join('&');
+  },
+
+  toJSON: function(object) {
+    var results = [];
+    this.prototype._each.call(object, function(pair) {
+      var value = Object.toJSON(pair.value);
+      if (value !== undefined) results.push(pair.key.toJSON() + ': ' + value);
+    });
+    return '{' + results.join(', ') + '}';
+  }
+});
+
+Hash.toQueryString.addPair = function(key, value, prefix) {
+  key = encodeURIComponent(key);
+  if (value === undefined) this.push(key);
+  else this.push(key + '=' + (value == null ? '' : encodeURIComponent(value)));
+}
+
+Object.extend(Hash.prototype, Enumerable);
+Object.extend(Hash.prototype, {
+  _each: function(iterator) {
+    for (var key in this) {
+      var value = this[key];
+      if (value && value == Hash.prototype[key]) continue;
+
+      var pair = [key, value];
+      pair.key = key;
+      pair.value = value;
+      iterator(pair);
+    }
+  },
+
+  keys: function() {
+    return this.pluck('key');
+  },
+
+  values: function() {
+    return this.pluck('value');
+  },
+
+  merge: function(hash) {
+    return $H(hash).inject(this, function(mergedHash, pair) {
+      mergedHash[pair.key] = pair.value;
+      return mergedHash;
+    });
+  },
+
+  remove: function() {
+    var result;
+    for(var i = 0, length = arguments.length; i < length; i++) {
+      var value = this[arguments[i]];
+      if (value !== undefined){
+        if (result === undefined) result = value;
+        else {
+          if (result.constructor != Array) result = [result];
+          result.push(value)
+        }
+      }
+      delete this[arguments[i]];
+    }
+    return result;
+  },
+
+  toQueryString: function() {
+    return Hash.toQueryString(this);
+  },
+
+  inspect: function() {
+    return '#<Hash:{' + this.map(function(pair) {
+      return pair.map(Object.inspect).join(': ');
+    }).join(', ') + '}>';
+  },
+
+  toJSON: function() {
+    return Hash.toJSON(this);
+  }
+});
+
+function $H(object) {
+  if (object instanceof Hash) return object;
+  return new Hash(object);
+};
+
+// Safari iterates over shadowed properties
+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;
+}()) Hash.prototype._each = function(iterator) {
+  var cache = [];
+  for (var key in this) {
+    var value = this[key];
+    if ((value && value == Hash.prototype[key]) || cache.include(key)) continue;
+    cache.push(key);
+    var pair = [key, value];
+    pair.key = key;
+    pair.value = value;
+    iterator(pair);
+  }
+};
+ObjectRange = Class.create();
+Object.extend(ObjectRange.prototype, Enumerable);
+Object.extend(ObjectRange.prototype, {
+  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 (typeof responder[callback] == 'function') {
+        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 = function() {};
+Ajax.Base.prototype = {
+  setOptions: function(options) {
+    this.options = {
+      method:       'post',
+      asynchronous: true,
+      contentType:  'application/x-www-form-urlencoded',
+      encoding:     'UTF-8',
+      parameters:   ''
+    }
+    Object.extend(this.options, options || {});
+
+    this.options.method = this.options.method.toLowerCase();
+    if (typeof this.options.parameters == 'string')
+      this.options.parameters = this.options.parameters.toQueryParams();
+  }
+}
+
+Ajax.Request = Class.create();
+Ajax.Request.Events =
+  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
+
+Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
+  _complete: false,
+
+  initialize: function(url, options) {
+    this.transport = Ajax.getTransport();
+    this.setOptions(options);
+    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 = Hash.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 {
+      if (this.options.onCreate) this.options.onCreate(this.transport);
+      Ajax.Responders.dispatch('onCreate', this, this.transport);
+
+      this.transport.open(this.method.toUpperCase(), this.url,
+        this.options.asynchronous);
+
+      if (this.options.asynchronous)
+        setTimeout(function() { this.respondToReadyState(1) }.bind(this), 10);
+
+      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 (typeof extras.push == 'function')
+        for (var i = 0, length = extras.length; i < length; i += 2)
+          headers[extras[i]] = extras[i+1];
+      else
+        $H(extras).each(function(pair) { headers[pair.key] = pair.value });
+    }
+
+    for (var name in headers)
+      this.transport.setRequestHeader(name, headers[name]);
+  },
+
+  success: function() {
+    return !this.transport.status
+        || (this.transport.status >= 200 && this.transport.status < 300);
+  },
+
+  respondToReadyState: function(readyState) {
+    var state = Ajax.Request.Events[readyState];
+    var transport = this.transport, json = this.evalJSON();
+
+    if (state == 'Complete') {
+      try {
+        this._complete = true;
+        (this.options['on' + this.transport.status]
+         || this.options['on' + (this.success() ? 'Success' : 'Failure')]
+         || Prototype.emptyFunction)(transport, json);
+      } catch (e) {
+        this.dispatchException(e);
+      }
+
+      var contentType = this.getHeader('Content-type');
+      if (contentType && contentType.strip().
+        match(/^(text|application)\/(x-)?(java|ecma)script(;.*)?$/i))
+          this.evalResponse();
+    }
+
+    try {
+      (this.options['on' + state] || Prototype.emptyFunction)(transport, json);
+      Ajax.Responders.dispatch('on' + state, this, transport, json);
+    } 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 }
+  },
+
+  evalJSON: function() {
+    try {
+      var json = this.getHeader('X-JSON');
+      return json ? json.evalJSON() : null;
+    } catch (e) { return null }
+  },
+
+  evalResponse: function() {
+    try {
+      return eval((this.transport.responseText || '').unfilterJSON());
+    } catch (e) {
+      this.dispatchException(e);
+    }
+  },
+
+  dispatchException: function(exception) {
+    (this.options.onException || Prototype.emptyFunction)(this, exception);
+    Ajax.Responders.dispatch('onException', this, exception);
+  }
+});
+
+Ajax.Updater = Class.create();
+
+Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {
+  initialize: function(container, url, options) {
+    this.container = {
+      success: (container.success || container),
+      failure: (container.failure || (container.success ? null : container))
+    }
+
+    this.transport = Ajax.getTransport();
+    this.setOptions(options);
+
+    var onComplete = this.options.onComplete || Prototype.emptyFunction;
+    this.options.onComplete = (function(transport, param) {
+      this.updateContent();
+      onComplete(transport, param);
+    }).bind(this);
+
+    this.request(url);
+  },
+
+  updateContent: function() {
+    var receiver = this.container[this.success() ? 'success' : 'failure'];
+    var response = this.transport.responseText;
+
+    if (!this.options.evalScripts) response = response.stripScripts();
+
+    if (receiver = $(receiver)) {
+      if (this.options.insertion)
+        new this.options.insertion(receiver, response);
+      else
+        receiver.update(response);
+    }
+
+    if (this.success()) {
+      if (this.onComplete)
+        setTimeout(this.onComplete.bind(this), 10);
+    }
+  }
+});
+
+Ajax.PeriodicalUpdater = Class.create();
+Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {
+  initialize: function(container, url, options) {
+    this.setOptions(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(request) {
+    if (this.options.decay) {
+      this.decay = (request.responseText == this.lastText ?
+        this.decay * this.options.decay : 1);
+
+      this.lastText = request.responseText;
+    }
+    this.timer = setTimeout(this.onTimerEvent.bind(this),
+      this.decay * this.frequency * 1000);
+  },
+
+  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 (typeof element == 'string')
+    element = document.getElementById(element);
+  return Element.extend(element);
+}
+
+if (Prototype.BrowserFeatures.XPath) {
+  document._getElementsByXPath = function(expression, parentElement) {
+    var results = [];
+    var query = document.evaluate(expression, $(parentElement) || document,
+      null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
+    for (var i = 0, length = query.snapshotLength; i < length; i++)
+      results.push(query.snapshotItem(i));
+    return results;
+  };
+
+  document.getElementsByClassName = function(className, parentElement) {
+    var q = ".//*[contains(concat(' ', @class, ' '), ' " + className + " ')]";
+    return document._getElementsByXPath(q, parentElement);
+  }
+
+} else document.getElementsByClassName = function(className, parentElement) {
+  var children = ($(parentElement) || document.body).getElementsByTagName('*');
+  var elements = [], child;
+  for (var i = 0, length = children.length; i < length; i++) {
+    child = children[i];
+    if (Element.hasClassName(child, className))
+      elements.push(Element.extend(child));
+  }
+  return elements;
+};
+
+/*--------------------------------------------------------------------------*/
+
+if (!window.Element) var Element = {};
+
+Element.extend = function(element) {
+  var F = Prototype.BrowserFeatures;
+  if (!element || !element.tagName || element.nodeType == 3 ||
+   element._extended || F.SpecificElementExtensions || element == window)
+    return element;
+
+  var methods = {}, tagName = element.tagName, cache = Element.extend.cache,
+   T = Element.Methods.ByTag;
+
+  // extend methods for all tags (Safari doesn't need this)
+  if (!F.ElementExtensions) {
+    Object.extend(methods, Element.Methods),
+    Object.extend(methods, Element.Methods.Simulated);
+  }
+
+  // extend methods for specific tags
+  if (T[tagName]) Object.extend(methods, T[tagName]);
+
+  for (var property in methods) {
+    var value = methods[property];
+    if (typeof value == 'function' && !(property in element))
+      element[property] = cache.findOrStore(value);
+  }
+
+  element._extended = Prototype.emptyFunction;
+  return element;
+};
+
+Element.extend.cache = {
+  findOrStore: function(value) {
+    return this[value] = this[value] || function() {
+      return value.apply(null, [this].concat($A(arguments)));
+    }
+  }
+};
+
+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, html) {
+    html = typeof html == 'undefined' ? '' : html.toString();
+    $(element).innerHTML = html.stripScripts();
+    setTimeout(function() {html.evalScripts()}, 10);
+    return element;
+  },
+
+  replace: function(element, html) {
+    element = $(element);
+    html = typeof html == 'undefined' ? '' : html.toString();
+    if (element.outerHTML) {
+      element.outerHTML = html.stripScripts();
+    } else {
+      var range = element.ownerDocument.createRange();
+      range.selectNodeContents(element);
+      element.parentNode.replaceChild(
+        range.createContextualFragment(html.stripScripts()), element);
+    }
+    setTimeout(function() {html.evalScripts()}, 10);
+    return element;
+  },
+
+  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 = $(element);
+    return element.previousSiblings().reverse().concat(element.nextSiblings());
+  },
+
+  match: function(element, selector) {
+    if (typeof selector == 'string')
+      selector = new Selector(selector);
+    return selector.match($(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];
+  },
+
+  getElementsBySelector: function() {
+    var args = $A(arguments), element = $(args.shift());
+    return Selector.findChildElements(element, args);
+  },
+
+  getElementsByClassName: function(element, className) {
+    return document.getElementsByClassName(className, element);
+  },
+
+  readAttribute: function(element, name) {
+    element = $(element);
+    if (Prototype.Browser.IE) {
+      if (!element.attributes) return null;
+      var t = Element._attributeTranslations;
+      if (t.values[name]) return t.values[name](element, name);
+      if (t.names[name])  name = t.names[name];
+      var attribute = element.attributes[name];
+      return attribute ? attribute.nodeValue : null;
+    }
+    return element.getAttribute(name);
+  },
+
+  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 = $(element))) return;
+    var elementClassName = element.className;
+    if (elementClassName.length == 0) return false;
+    if (elementClassName == className ||
+        elementClassName.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
+      return true;
+    return false;
+  },
+
+  addClassName: function(element, className) {
+    if (!(element = $(element))) return;
+    Element.classNames(element).add(className);
+    return element;
+  },
+
+  removeClassName: function(element, className) {
+    if (!(element = $(element))) return;
+    Element.classNames(element).remove(className);
+    return element;
+  },
+
+  toggleClassName: function(element, className) {
+    if (!(element = $(element))) return;
+    Element.classNames(element)[element.hasClassName(className) ? 'remove' : 'add'](className);
+    return element;
+  },
+
+  observe: function() {
+    Event.observe.apply(Event, arguments);
+    return $A(arguments).first();
+  },
+
+  stopObserving: function() {
+    Event.stopObserving.apply(Event, arguments);
+    return $A(arguments).first();
+  },
+
+  // 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);
+    while (element = element.parentNode)
+      if (element == ancestor) return true;
+    return false;
+  },
+
+  scrollTo: function(element) {
+    element = $(element);
+    var pos = Position.cumulativeOffset(element);
+    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, camelized) {
+    element = $(element);
+    var elementStyle = element.style;
+
+    for (var property in styles)
+      if (property == 'opacity') element.setOpacity(styles[property])
+      else
+        elementStyle[(property == 'float' || property == 'cssFloat') ?
+          (elementStyle.styleFloat === undefined ? 'cssFloat' : 'styleFloat') :
+          (camelized ? property : property.camelize())] = 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.style.overflow || 'auto';
+    if ((Element.getStyle(element, 'overflow') || 'visible') != '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;
+  }
+};
+
+Object.extend(Element.Methods, {
+  childOf: Element.Methods.descendantOf,
+  childElements: Element.Methods.immediateDescendants
+});
+
+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);
+    }
+  };
+}
+else if (Prototype.Browser.IE) {
+  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) {
+    element = $(element);
+    var filter = element.getStyle('filter'), style = element.style;
+    if (value == 1 || value === '') {
+      style.filter = filter.replace(/alpha\([^\)]*\)/gi,'');
+      return element;
+    } else if (value < 0.00001) value = 0;
+    style.filter = filter.replace(/alpha\([^\)]*\)/gi, '') +
+      'alpha(opacity=' + (value * 100) + ')';
+    return element;
+  };
+
+  // IE is missing .innerHTML support for TABLE-related elements
+  Element.Methods.update = function(element, html) {
+    element = $(element);
+    html = typeof html == 'undefined' ? '' : html.toString();
+    var tagName = element.tagName.toUpperCase();
+    if (['THEAD','TBODY','TR','TD'].include(tagName)) {
+      var div = document.createElement('div');
+      switch (tagName) {
+        case 'THEAD':
+        case 'TBODY':
+          div.innerHTML = '<table><tbody>' +  html.stripScripts() + '</tbody></table>';
+          depth = 2;
+          break;
+        case 'TR':
+          div.innerHTML = '<table><tbody><tr>' +  html.stripScripts() + '</tr></tbody></table>';
+          depth = 3;
+          break;
+        case 'TD':
+          div.innerHTML = '<table><tbody><tr><td>' +  html.stripScripts() + '</td></tr></tbody></table>';
+          depth = 4;
+      }
+      $A(element.childNodes).each(function(node) { element.removeChild(node) });
+      depth.times(function() { div = div.firstChild });
+      $A(div.childNodes).each(function(node) { element.appendChild(node) });
+    } else {
+      element.innerHTML = html.stripScripts();
+    }
+    setTimeout(function() { html.evalScripts() }, 10);
+    return element;
+  }
+}
+else if (Prototype.Browser.Gecko) {
+  Element.Methods.setOpacity = function(element, value) {
+    element = $(element);
+    element.style.opacity = (value == 1) ? 0.999999 :
+      (value === '') ? '' : (value < 0.00001) ? 0 : value;
+    return element;
+  };
+}
+
+Element._attributeTranslations = {
+  names: {
+    colspan:   "colSpan",
+    rowspan:   "rowSpan",
+    valign:    "vAlign",
+    datetime:  "dateTime",
+    accesskey: "accessKey",
+    tabindex:  "tabIndex",
+    enctype:   "encType",
+    maxlength: "maxLength",
+    readonly:  "readOnly",
+    longdesc:  "longDesc"
+  },
+  values: {
+    _getAttr: function(element, attribute) {
+      return element.getAttribute(attribute, 2);
+    },
+    _flag: function(element, attribute) {
+      return $(element).hasAttribute(attribute) ? attribute : null;
+    },
+    style: function(element) {
+      return element.style.cssText.toLowerCase();
+    },
+    title: function(element) {
+      var node = element.getAttributeNode('title');
+      return node.specified ? node.nodeValue : null;
+    }
+  }
+};
+
+(function() {
+  Object.extend(this, {
+    href: this._getAttr,
+    src:  this._getAttr,
+    type: this._getAttr,
+    disabled: this._flag,
+    checked:  this._flag,
+    readonly: this._flag,
+    multiple: this._flag
+  });
+}).call(Element._attributeTranslations.values);
+
+Element.Methods.Simulated = {
+  hasAttribute: function(element, attribute) {
+    var t = Element._attributeTranslations, node;
+    attribute = t.names[attribute] || attribute;
+    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.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 (tagName.constructor == Array) 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;
+    var cache = Element.extend.cache;
+    for (var property in methods) {
+      var value = methods[property];
+      if (!onlyIfAbsent || !(property in destination))
+        destination[property] = cache.findOrStore(value);
+    }
+  }
+
+  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 (typeof klass == "undefined") continue;
+      copy(T[tag], klass.prototype);
+    }
+  }
+
+  Object.extend(Element, Element.Methods);
+  delete Element.ByTag;
+};
+
+var Toggle = { display: Element.toggle };
+
+/*--------------------------------------------------------------------------*/
+
+Abstract.Insertion = function(adjacency) {
+  this.adjacency = adjacency;
+}
+
+Abstract.Insertion.prototype = {
+  initialize: function(element, content) {
+    this.element = $(element);
+    this.content = content.stripScripts();
+
+    if (this.adjacency && this.element.insertAdjacentHTML) {
+      try {
+        this.element.insertAdjacentHTML(this.adjacency, this.content);
+      } catch (e) {
+        var tagName = this.element.tagName.toUpperCase();
+        if (['TBODY', 'TR'].include(tagName)) {
+          this.insertContent(this.contentFromAnonymousTable());
+        } else {
+          throw e;
+        }
+      }
+    } else {
+      this.range = this.element.ownerDocument.createRange();
+      if (this.initializeRange) this.initializeRange();
+      this.insertContent([this.range.createContextualFragment(this.content)]);
+    }
+
+    setTimeout(function() {content.evalScripts()}, 10);
+  },
+
+  contentFromAnonymousTable: function() {
+    var div = document.createElement('div');
+    div.innerHTML = '<table><tbody>' + this.content + '</tbody></table>';
+    return $A(div.childNodes[0].childNodes[0].childNodes);
+  }
+}
+
+var Insertion = new Object();
+
+Insertion.Before = Class.create();
+Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), {
+  initializeRange: function() {
+    this.range.setStartBefore(this.element);
+  },
+
+  insertContent: function(fragments) {
+    fragments.each((function(fragment) {
+      this.element.parentNode.insertBefore(fragment, this.element);
+    }).bind(this));
+  }
+});
+
+Insertion.Top = Class.create();
+Insertion.Top.prototype = Object.extend(new Abstract.Insertion('afterBegin'), {
+  initializeRange: function() {
+    this.range.selectNodeContents(this.element);
+    this.range.collapse(true);
+  },
+
+  insertContent: function(fragments) {
+    fragments.reverse(false).each((function(fragment) {
+      this.element.insertBefore(fragment, this.element.firstChild);
+    }).bind(this));
+  }
+});
+
+Insertion.Bottom = Class.create();
+Insertion.Bottom.prototype = Object.extend(new Abstract.Insertion('beforeEnd'), {
+  initializeRange: function() {
+    this.range.selectNodeContents(this.element);
+    this.range.collapse(this.element);
+  },
+
+  insertContent: function(fragments) {
+    fragments.each((function(fragment) {
+      this.element.appendChild(fragment);
+    }).bind(this));
+  }
+});
+
+Insertion.After = Class.create();
+Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), {
+  initializeRange: function() {
+    this.range.setStartAfter(this.element);
+  },
+
+  insertContent: function(fragments) {
+    fragments.each((function(fragment) {
+      this.element.parentNode.insertBefore(fragment,
+        this.element.nextSibling);
+    }).bind(this));
+  }
+});
+
+/*--------------------------------------------------------------------------*/
+
+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);
+/* 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();
+
+Selector.prototype = {
+  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-]*?:/).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(typeof c[i] == 'function' ? 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(typeof x[i] == 'function' ? 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) {
+    return this.findElements(document).include(element);
+  },
+
+  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 (typeof h === 'function') 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 = typeof x[i] == 'function' ? 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|([^'"][^\]]*?)))?\]/
+  },
+
+  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--) {
+          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 (!nodes && root == document) return targetNode ? [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) {
+      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 (typeof expression == 'number') {
+      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, getHash) {
+    var data = elements.inject({}, function(result, element) {
+      if (!element.disabled && element.name) {
+        var key = element.name, value = $(element).getValue();
+        if (value != null) {
+         	if (key in result) {
+            if (result[key].constructor != Array) result[key] = [result[key]];
+            result[key].push(value);
+          }
+          else result[key] = value;
+        }
+      }
+      return result;
+    });
+
+    return getHash ? data : Hash.toQueryString(data);
+  }
+};
+
+Form.Methods = {
+  serialize: function(form, getHash) {
+    return Form.serializeElements(Form.getElements(form), getHash);
+  },
+
+  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) {
+    return $(form).getElements().find(function(element) {
+      return element.type != 'hidden' && !element.disabled &&
+        ['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;
+    options.parameters = form.serialize(true);
+
+    if (params) {
+      if (typeof params == 'string') params = params.toQueryParams();
+      Object.extend(options.parameters, params);
+    }
+
+    if (form.hasAttribute('method') && !options.method)
+      options.method = form.method;
+
+    return new Ajax.Request(form.readAttribute('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 Hash.toQueryString(pair);
+      }
+    }
+    return '';
+  },
+
+  getValue: function(element) {
+    element = $(element);
+    var method = element.tagName.toLowerCase();
+    return Form.Element.Serializers[method](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) {
+    switch (element.type.toLowerCase()) {
+      case 'checkbox':
+      case 'radio':
+        return Form.Element.Serializers.inputSelector(element);
+      default:
+        return Form.Element.Serializers.textarea(element);
+    }
+  },
+
+  inputSelector: function(element) {
+    return element.checked ? element.value : null;
+  },
+
+  textarea: function(element) {
+    return element.value;
+  },
+
+  select: function(element) {
+    return this[element.type == 'select-one' ?
+      'selectOne' : 'selectMany'](element);
+  },
+
+  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 = function() {}
+Abstract.TimedObserver.prototype = {
+  initialize: function(element, frequency, callback) {
+    this.frequency = frequency;
+    this.element   = $(element);
+    this.callback  = callback;
+
+    this.lastValue = this.getValue();
+    this.registerCallback();
+  },
+
+  registerCallback: function() {
+    setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
+  },
+
+  onTimerEvent: function() {
+    var value = this.getValue();
+    var changed = ('string' == typeof this.lastValue && 'string' == typeof value
+      ? this.lastValue != value : String(this.lastValue) != String(value));
+    if (changed) {
+      this.callback(this.element, value);
+      this.lastValue = value;
+    }
+  }
+}
+
+Form.Element.Observer = Class.create();
+Form.Element.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
+  getValue: function() {
+    return Form.Element.getValue(this.element);
+  }
+});
+
+Form.Observer = Class.create();
+Form.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
+  getValue: function() {
+    return Form.serialize(this.element);
+  }
+});
+
+/*--------------------------------------------------------------------------*/
+
+Abstract.EventObserver = function() {}
+Abstract.EventObserver.prototype = {
+  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.bind(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();
+Form.Element.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
+  getValue: function() {
+    return Form.Element.getValue(this.element);
+  }
+});
+
+Form.EventObserver = Class.create();
+Form.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
+  getValue: function() {
+    return Form.serialize(this.element);
+  }
+});
+if (!window.Event) {
+  var Event = new Object();
+}
+
+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,
+
+  element: function(event) {
+    return $(event.target || event.srcElement);
+  },
+
+  isLeftClick: function(event) {
+    return (((event.which) && (event.which == 1)) ||
+            ((event.button) && (event.button == 1)));
+  },
+
+  pointerX: function(event) {
+    return event.pageX || (event.clientX +
+      (document.documentElement.scrollLeft || document.body.scrollLeft));
+  },
+
+  pointerY: function(event) {
+    return event.pageY || (event.clientY +
+      (document.documentElement.scrollTop || document.body.scrollTop));
+  },
+
+  stop: function(event) {
+    if (event.preventDefault) {
+      event.preventDefault();
+      event.stopPropagation();
+    } else {
+      event.returnValue = false;
+      event.cancelBubble = true;
+    }
+  },
+
+  // find the first node with the given tagName, starting from the
+  // node the event was triggered on; traverses the DOM upwards
+  findElement: function(event, tagName) {
+    var element = Event.element(event);
+    while (element.parentNode && (!element.tagName ||
+        (element.tagName.toUpperCase() != tagName.toUpperCase())))
+      element = element.parentNode;
+    return element;
+  },
+
+  observers: false,
+
+  _observeAndCache: function(element, name, observer, useCapture) {
+    if (!this.observers) this.observers = [];
+    if (element.addEventListener) {
+      this.observers.push([element, name, observer, useCapture]);
+      element.addEventListener(name, observer, useCapture);
+    } else if (element.attachEvent) {
+      this.observers.push([element, name, observer, useCapture]);
+      element.attachEvent('on' + name, observer);
+    }
+  },
+
+  unloadCache: function() {
+    if (!Event.observers) return;
+    for (var i = 0, length = Event.observers.length; i < length; i++) {
+      Event.stopObserving.apply(this, Event.observers[i]);
+      Event.observers[i][0] = null;
+    }
+    Event.observers = false;
+  },
+
+  observe: function(element, name, observer, useCapture) {
+    element = $(element);
+    useCapture = useCapture || false;
+
+    if (name == 'keypress' &&
+      (Prototype.Browser.WebKit || element.attachEvent))
+      name = 'keydown';
+
+    Event._observeAndCache(element, name, observer, useCapture);
+  },
+
+  stopObserving: function(element, name, observer, useCapture) {
+    element = $(element);
+    useCapture = useCapture || false;
+
+    if (name == 'keypress' &&
+        (Prototype.Browser.WebKit || element.attachEvent))
+      name = 'keydown';
+
+    if (element.removeEventListener) {
+      element.removeEventListener(name, observer, useCapture);
+    } else if (element.detachEvent) {
+      try {
+        element.detachEvent('on' + name, observer);
+      } catch (e) {}
+    }
+  }
+});
+
+/* prevent memory leaks in IE */
+if (Prototype.Browser.IE)
+  Event.observe(window, 'unload', Event.unloadCache, false);
+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;
+  },
+
+  realOffset: function(element) {
+    var valueT = 0, valueL = 0;
+    do {
+      valueT += element.scrollTop  || 0;
+      valueL += element.scrollLeft || 0;
+      element = element.parentNode;
+    } while (element);
+    return [valueL, valueT];
+  },
+
+  cumulativeOffset: function(element) {
+    var valueT = 0, valueL = 0;
+    do {
+      valueT += element.offsetTop  || 0;
+      valueL += element.offsetLeft || 0;
+      element = element.offsetParent;
+    } while (element);
+    return [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 [valueL, valueT];
+  },
+
+  offsetParent: 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;
+  },
+
+  // 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 = this.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 = this.realOffset(element);
+
+    this.xcomp = x + offsetcache[0] - this.deltaX;
+    this.ycomp = y + offsetcache[1] - this.deltaY;
+    this.offset = this.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;
+  },
+
+  page: 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)
+        if (Element.getStyle(element,'position')=='absolute') break;
+
+    } while (element = element.offsetParent);
+
+    element = forElement;
+    do {
+      if (!window.opera || element.tagName=='BODY') {
+        valueT -= element.scrollTop  || 0;
+        valueL -= element.scrollLeft || 0;
+      }
+    } while (element = element.parentNode);
+
+    return [valueL, valueT];
+  },
+
+  clone: function(source, target) {
+    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 = Position.page(source);
+
+    // find coordinate system to use
+    target = $(target);
+    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(target,'position') == 'absolute') {
+      parent = Position.offsetParent(target);
+      delta = Position.page(parent);
+    }
+
+    // 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)   target.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
+    if(options.setTop)    target.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
+    if(options.setWidth)  target.style.width = source.offsetWidth + 'px';
+    if(options.setHeight) target.style.height = source.offsetHeight + 'px';
+  },
+
+  absolutize: function(element) {
+    element = $(element);
+    if (element.style.position == 'absolute') return;
+    Position.prepare();
+
+    var offsets = Position.positionedOffset(element);
+    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';
+  },
+
+  relativize: function(element) {
+    element = $(element);
+    if (element.style.position == 'relative') return;
+    Position.prepare();
+
+    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;
+  }
+}
+
+// Safari returns margins on body which is incorrect if the child is absolutely
+// positioned.  For performance reasons, redefine Position.cumulativeOffset for
+// KHTML/WebKit only.
+if (Prototype.Browser.WebKit) {
+  Position.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 [valueL, valueT];
+  }
+}
+
+Element.addMethods();
\ No newline at end of file
diff --git a/templates/_form_elements.tmpl b/templates/_form_elements.tmpl
new file mode 100644
index 0000000..18c57c8
--- /dev/null
+++ b/templates/_form_elements.tmpl
@@ -0,0 +1,26 @@
+<p>Units:
+<select id="unitselector" name="units">
+<option values="centimeters"#if $getVar('units', '') == 'centimeters'# selected="selected"'#end if#>centimeters</option>
+<option value="inches"#if $getVar('units', '') == 'inches'# selected="selected"'#end if#>inches</option>
+</select>
+</p>
+
+<p><label for="pixel_width">Your screen width (in pixels):</label>
+<input type="text" name="pixel_width" value="$getVar('pixel_width', None)" /></p>
+
+<p><label for="unit_width">Your screen width (in <span class="unittext">units</span>):</label>
+<input type="text" name="unit_width" value="$getVar('unit_width', None)" /></p>
+
+<script>
+// simple chunk of javascript to handle changes
+var unit_selector = $("unitselector");
+function change_unit_text() {
+  var text_spans = document.getElementsByClassName('unittext');
+  for (i = 0; i < text_spans.length; i++) {
+    var text_span = text_spans[i];
+    Element.update(text_span, unit_selector.value);
+  }
+}
+change_unit_text();
+Event.observe(unit_selector, 'change', change_unit_text);
+</script>
diff --git a/templates/gallery.tmpl b/templates/gallery.tmpl
new file mode 100644
index 0000000..b615ef5
--- /dev/null
+++ b/templates/gallery.tmpl
@@ -0,0 +1,47 @@
+#extends site
+
+#block body
+
+<h2>Gallery of Existing Rulers</h2>
+
+<table>
+<tr>
+<th>Model</th>
+<th>Pixel Width</th>
+<th>Width (cm/in)</th>
+<th>Rulers</th>
+<th></th>
+</tr>
+#for $ruler in $rulers
+<tr>
+  <td>$ruler.model</td>
+  <td>$ruler.pixel_width</td>
+  <td>$ruler.cm_width()/$ruler.in_width</td>
+  <td>
+    <a href="/show/ruler_${ruler.pixel_width}px_${ruler.cm_width}centimeters.png?fromgallery=true">cm</a>
+    <a href="/show/ruler_${ruler.pixel_width}px_${ruler.in_width}inches.png?fromgallery=true">in</a>
+  </td>
+  <td><form method="GET" action="delete/$ruler.id" style="display:inline;">
+      <input type="submit" value="delete" /></form></td>
+</tr>
+#end for
+</table>
+
+<h2>Add Your Ruler</h2>
+
+<p>If your ruler is not on the list you should add it with the box
+form.</p>
+
+
+<form method="POST" action="/gallery">
+
+#include 'templates/_form_elements.tmpl'
+
+<p><label for="model">Laptop or monitor model:</label>
+<input type="text" name="model" size="50" maxlength="100"
+value="$getVar("model", None)" /></p>
+
+<input type="Submit" name="submit" value="Save" />
+</form>
+
+#end block body
diff --git a/templates/index.tmpl b/templates/index.tmpl
new file mode 100644
index 0000000..d8cdc81
--- /dev/null
+++ b/templates/index.tmpl
@@ -0,0 +1,20 @@
+#extends site
+
+#block body
+
+<h1>Screen Ruler Generator</h1>
+
+<h2>Create a new screen ruler</h2>
+
+<form method="POST" action="/">
+
+#include 'templates/_form_elements.tmpl'
+
+<input type="Submit" name="submit" value="Generate" />
+<form>
+
+<p>To view a list of rulers others have created or to save your ruler so
+that others with your computer can find it, visit the <a
+href="/gallery">ruler gallery</a>.</p>
+
+#end block body
diff --git a/templates/show_ruler.tmpl b/templates/show_ruler.tmpl
new file mode 100644
index 0000000..397314f
--- /dev/null
+++ b/templates/show_ruler.tmpl
@@ -0,0 +1,17 @@
+#extends site
+
+#block body
+
+<h2>Your Ruler</h2>
+
+<img src="/$ruler_url" alt="$ruler_url" />
+
+#if $fromgallery
+<p><a href="/gallery">Back to gallery</a>.</p>
+#else
+<p><a href="/gallery/$ruler_url">Save your ruler to the gallery</a> for others to use in
+the future.</p>
+#end if
+
+#end block body
+
diff --git a/templates/site.tmpl b/templates/site.tmpl
new file mode 100644
index 0000000..75461cf
--- /dev/null
+++ b/templates/site.tmpl
@@ -0,0 +1,10 @@
+<html>
+<head>
+  <script src="/static/prototype.js" type="text/javascript"></script>
+</head>
+<body>
+#filter Filter
+$body
+#end filter
+</body>
+</html>