diff --git a/actionpack/lib/action_view/helpers/javascripts/prototype.js b/actionpack/lib/action_view/helpers/javascripts/prototype.js
index 7fa1c7e33b..0ba70a77da 100644
--- a/actionpack/lib/action_view/helpers/javascripts/prototype.js
+++ b/actionpack/lib/action_view/helpers/javascripts/prototype.js
@@ -1,4 +1,4 @@
-/*  Prototype JavaScript framework, version 1.4.0_rc1
+/*  Prototype JavaScript framework, version 1.4.0_rc2
  *  (c) 2005 Sam Stephenson <sam@conio.net>
  *
  *  THIS FILE IS AUTOMATICALLY GENERATED. When sending patches, please diff
@@ -11,7 +11,7 @@
 /*--------------------------------------------------------------------------*/
 
 var Prototype = {
-  Version: '1.4.0_rc1',
+  Version: '1.4.0_rc2',
 
   emptyFunction: function() {},
   K: function(x) {return x}
@@ -787,7 +787,7 @@ Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {
 document.getElementsByClassName = function(className, parentElement) {
   var children = ($(parentElement) || document.body).getElementsByTagName('*');
   return $A(children).inject([], function(elements, child) {
-    if (Element.hasClassName(child, className))
+    if (child.className.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
       elements.push(child);
     return elements;
   });
@@ -1131,7 +1131,7 @@ var Form = {
   },
 
   getElements: function(form) {
-    var form = $(form);
+    form = $(form);
     var elements = new Array();
 
     for (tagName in Form.Element.Serializers) {
@@ -1143,7 +1143,7 @@ var Form = {
   },
 
   getInputs: function(form, typeName, name) {
-    var form = $(form);
+    form = $(form);
     var inputs = form.getElementsByTagName('input');
 
     if (!typeName && !name)
@@ -1179,7 +1179,7 @@ var Form = {
   },
 
   focusFirstElement: function(form) {
-    var form = $(form);
+    form = $(form);
     var elements = Form.getElements(form);
     for (var i = 0; i < elements.length; i++) {
       var element = elements[i];
@@ -1197,7 +1197,7 @@ var Form = {
 
 Form.Element = {
   serialize: function(element) {
-    var element = $(element);
+    element = $(element);
     var method = element.tagName.toLowerCase();
     var parameter = Form.Element.Serializers[method](element);
 
@@ -1207,7 +1207,7 @@ Form.Element = {
   },
 
   getValue: function(element) {
-    var element = $(element);
+    element = $(element);
     var method = element.tagName.toLowerCase();
     var parameter = Form.Element.Serializers[method](element);
 
diff --git a/railties/html/javascripts/prototype.js b/railties/html/javascripts/prototype.js
index 120f4cb988..0ba70a77da 100644
--- a/railties/html/javascripts/prototype.js
+++ b/railties/html/javascripts/prototype.js
@@ -1,4 +1,4 @@
-/*  Prototype JavaScript framework, version 1.4.0_rc0
+/*  Prototype JavaScript framework, version 1.4.0_rc2
  *  (c) 2005 Sam Stephenson <sam@conio.net>
  *
  *  THIS FILE IS AUTOMATICALLY GENERATED. When sending patches, please diff
@@ -11,7 +11,7 @@
 /*--------------------------------------------------------------------------*/
 
 var Prototype = {
-  Version: '1.4.0_rc0',
+  Version: '1.4.0_rc2',
 
   emptyFunction: function() {},
   K: function(x) {return x}
@@ -607,8 +607,8 @@ Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
 
     try {
       this.url = url;
-      if (this.options.method == 'get')
-        this.url += '?' + parameters;
+      if (this.options.method == 'get' && parameters.length > 0)
+        this.url += (this.url.match(/\?/) ? '&' : '?') + parameters;
 
       Ajax.Responders.dispatch('onCreate', this, this.transport);
 
@@ -626,6 +626,8 @@ Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
       this.transport.send(this.options.method == 'post' ? body : null);
 
     } catch (e) {
+      (this.options.onException || Prototype.emptyFunction)(this, e);
+      Ajax.Responders.dispatch('onException', this, e);
     }
   },
 
@@ -783,9 +785,9 @@ Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {
   }
 });
 document.getElementsByClassName = function(className, parentElement) {
-  var children = (document.body || $(parentElement)).getElementsByTagName('*');
+  var children = ($(parentElement) || document.body).getElementsByTagName('*');
   return $A(children).inject([], function(elements, child) {
-    if (Element.hasClassName(child, className))
+    if (child.className.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
       elements.push(child);
     return elements;
   });
@@ -1129,7 +1131,7 @@ var Form = {
   },
 
   getElements: function(form) {
-    var form = $(form);
+    form = $(form);
     var elements = new Array();
 
     for (tagName in Form.Element.Serializers) {
@@ -1141,7 +1143,7 @@ var Form = {
   },
 
   getInputs: function(form, typeName, name) {
-    var form = $(form);
+    form = $(form);
     var inputs = form.getElementsByTagName('input');
 
     if (!typeName && !name)
@@ -1177,7 +1179,7 @@ var Form = {
   },
 
   focusFirstElement: function(form) {
-    var form = $(form);
+    form = $(form);
     var elements = Form.getElements(form);
     for (var i = 0; i < elements.length; i++) {
       var element = elements[i];
@@ -1195,7 +1197,7 @@ var Form = {
 
 Form.Element = {
   serialize: function(element) {
-    var element = $(element);
+    element = $(element);
     var method = element.tagName.toLowerCase();
     var parameter = Form.Element.Serializers[method](element);
 
@@ -1205,7 +1207,7 @@ Form.Element = {
   },
 
   getValue: function(element) {
-    var element = $(element);
+    element = $(element);
     var method = element.tagName.toLowerCase();
     var parameter = Form.Element.Serializers[method](element);