diff --git a/build/build.xml b/build/build.xml
index 603916ed7..cf7d776a7 100644
--- a/build/build.xml
+++ b/build/build.xml
@@ -206,7 +206,6 @@
 		<get src="${url}Tabs" dest="${docs.dir}tabs.html" />
 
 		<get src="http://docs.jquery.com/action/render/UI/Utility/Position" dest="${docs.dir}position.html" />
-		<get src="http://docs.jquery.com/action/render/UI/Utility/Stackfix" dest="${docs.dir}stackfix.html" />
 		
 		<get src="http://docs.jquery.com/action/render/UI/Effects/animate" dest="${docs.dir}animate.html" />
 		<get src="http://docs.jquery.com/action/render/UI/Effects/addClass" dest="${docs.dir}addClass.html" />
diff --git a/demos/dialog/animated.html b/demos/dialog/animated.html
index dd84b25d4..43dfed061 100644
--- a/demos/dialog/animated.html
+++ b/demos/dialog/animated.html
@@ -4,20 +4,20 @@
 	<title>jQuery UI Dialog - Animation</title>
 	<link type="text/css" href="../../themes/base/ui.all.css" rel="stylesheet" />
 	<script type="text/javascript" src="../../jquery-1.3.2.js"></script>
+	<script type="text/javascript" src="../../external/jquery.bgiframe-2.1.1.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.core.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.widget.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.mouse.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.draggable.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.position.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.resizable.js"></script>
-	<script type="text/javascript" src="../../ui/jquery.ui.stackfix.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.dialog.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.effects.core.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.effects.blind.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.effects.explode.js"></script>
 	<link type="text/css" href="../demos.css" rel="stylesheet" />
 	<script type="text/javascript">
-	$.ui.dialog.prototype.options.stackfix = true;
+	$.ui.dialog.prototype.options.bgiframe = true;
 	// increase the default animation speed to exaggerate the effect
 	$.fx.speeds._default = 1000;
 	$(function() {
diff --git a/demos/dialog/default.html b/demos/dialog/default.html
index 62638f399..2625bdd33 100644
--- a/demos/dialog/default.html
+++ b/demos/dialog/default.html
@@ -4,17 +4,17 @@
 	<title>jQuery UI Dialog - Default functionality</title>
 	<link type="text/css" href="../../themes/base/ui.all.css" rel="stylesheet" />
 	<script type="text/javascript" src="../../jquery-1.3.2.js"></script>
+	<script type="text/javascript" src="../../external/jquery.bgiframe-2.1.1.js.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.core.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.widget.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.mouse.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.draggable.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.position.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.resizable.js"></script>
-	<script type="text/javascript" src="../../ui/jquery.ui.stackfix.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.dialog.js"></script>
 	<link type="text/css" href="../demos.css" rel="stylesheet" />
 	<script type="text/javascript">
-	$.ui.dialog.prototype.options.stackfix = true;
+	$.ui.dialog.prototype.options.bgiframe = true;
 	$(function() {
 		$("#dialog").dialog();
 	});
diff --git a/demos/dialog/modal-confirmation.html b/demos/dialog/modal-confirmation.html
index 8c5c0ba89..8369dcefe 100644
--- a/demos/dialog/modal-confirmation.html
+++ b/demos/dialog/modal-confirmation.html
@@ -4,6 +4,7 @@
 	<title>jQuery UI Dialog - Modal confirmation</title>
 	<link type="text/css" href="../../themes/base/ui.all.css" rel="stylesheet" />
 	<script type="text/javascript" src="../../jquery-1.3.2.js"></script>
+	<script type="text/javascript" src="../../external/jquery.bgiframe-2.1.1.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.core.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.widget.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.mouse.js"></script>
@@ -11,7 +12,6 @@
 	<script type="text/javascript" src="../../ui/jquery.ui.draggable.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.position.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.resizable.js"></script>
-	<script type="text/javascript" src="../../ui/jquery.ui.stackfix.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.dialog.js"></script>
 	<link type="text/css" href="../demos.css" rel="stylesheet" />
 	<script type="text/javascript">
@@ -20,7 +20,7 @@
 		$("#dialog").dialog("destroy");
 	
 		$("#dialog-confirm").dialog({
-			stackfix: true,
+			bgiframe: true,
 			resizable: false,
 			height:140,
 			modal: true,
diff --git a/demos/dialog/modal-form.html b/demos/dialog/modal-form.html
index ffcdd70fc..36160b159 100644
--- a/demos/dialog/modal-form.html
+++ b/demos/dialog/modal-form.html
@@ -4,6 +4,7 @@
 	<title>jQuery UI Dialog - Modal form</title>
 	<link type="text/css" href="../../themes/base/ui.all.css" rel="stylesheet" />
 	<script type="text/javascript" src="../../jquery-1.3.2.js"></script>
+	<script type="text/javascript" src="../../external/jquery.bgiframe-2.1.1.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.core.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.widget.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.mouse.js"></script>
@@ -11,7 +12,6 @@
 	<script type="text/javascript" src="../../ui/jquery.ui.draggable.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.position.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.resizable.js"></script>
-	<script type="text/javascript" src="../../ui/jquery.ui.stackfix.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.dialog.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.effects.core.js"></script>
 	<link type="text/css" href="../demos.css" rel="stylesheet" />
@@ -73,7 +73,7 @@
 		}
 		
 		$("#dialog-form").dialog({
-			stackfix: true,
+			bgiframe: true,
 			autoOpen: false,
 			height: 300,
 			width: 350,
diff --git a/demos/dialog/modal-message.html b/demos/dialog/modal-message.html
index 0fdae6a06..6478b84d9 100644
--- a/demos/dialog/modal-message.html
+++ b/demos/dialog/modal-message.html
@@ -4,6 +4,7 @@
 	<title>jQuery UI Dialog - Modal message</title>
 	<link type="text/css" href="../../themes/base/ui.all.css" rel="stylesheet" />
 	<script type="text/javascript" src="../../jquery-1.3.2.js"></script>
+	<script type="text/javascript" src="../../external/jquery.bgiframe-2.1.1.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.core.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.widget.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.mouse.js"></script>
@@ -11,7 +12,6 @@
 	<script type="text/javascript" src="../../ui/jquery.ui.draggable.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.position.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.resizable.js"></script>
-	<script type="text/javascript" src="../../ui/jquery.ui.stackfix.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.dialog.js"></script>
 	<link type="text/css" href="../demos.css" rel="stylesheet" />
 	<script type="text/javascript">
@@ -20,7 +20,7 @@
 		$("#dialog").dialog("destroy");
 	
 		$("#dialog-message").dialog({
-			stackfix: true,
+			bgiframe: true,
 			modal: true,
 			buttons: {
 				Ok: function() {
diff --git a/demos/dialog/modal.html b/demos/dialog/modal.html
index c852b0551..276c49717 100644
--- a/demos/dialog/modal.html
+++ b/demos/dialog/modal.html
@@ -4,13 +4,13 @@
 	<title>jQuery UI Dialog - Basic modal</title>
 	<link type="text/css" href="../../themes/base/ui.all.css" rel="stylesheet" />
 	<script type="text/javascript" src="../../jquery-1.3.2.js"></script>
+	<script type="text/javascript" src="../../external/jquery.bgiframe-2.1.1.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.core.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.widget.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.mouse.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.draggable.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.position.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.resizable.js"></script>
-	<script type="text/javascript" src="../../ui/jquery.ui.stackfix.js"></script>
 	<script type="text/javascript" src="../../ui/jquery.ui.dialog.js"></script>
 	<link type="text/css" href="../demos.css" rel="stylesheet" />
 	<script type="text/javascript">
@@ -19,7 +19,7 @@
 		$("#dialog").dialog("destroy");
 	
 		$("#dialog-modal").dialog({
-			stackfix: true,
+			bgiframe: true,
 			height: 140,
 			modal: true
 		});
diff --git a/demos/index.html b/demos/index.html
index f3505f993..fe7b6f71d 100644
--- a/demos/index.html
+++ b/demos/index.html
@@ -6,10 +6,10 @@
 	<link type="text/css" href="../themes/base/ui.all.css" rel="stylesheet" />
 	<link type="text/css" href="demos.css" rel="stylesheet" />
 	<script type="text/javascript" src="../jquery-1.3.2.js"></script>
+	<script type="text/javascript" src="../external/jquery.bgiframe-2.1.1.js"></script>
 	<script type="text/javascript" src="../ui/jquery.ui.core.js"></script>
 	<script type="text/javascript" src="../ui/jquery.ui.widget.js"></script>
 	<script type="text/javascript" src="../ui/jquery.ui.mouse.js"></script>
-	<script type="text/javascript" src="../ui/jquery.ui.stackfix.js"></script>
 	<script type="text/javascript" src="../ui/jquery.ui.accordion.js"></script>
 	<script type="text/javascript" src="../ui/jquery.ui.autocomplete.js"></script>
 	<script type="text/javascript" src="../ui/jquery.ui.button.js"></script>
diff --git a/external/jquery.bgiframe-2.1.1.js b/external/jquery.bgiframe-2.1.1.js
new file mode 100644
index 000000000..ef8679d90
--- /dev/null
+++ b/external/jquery.bgiframe-2.1.1.js
@@ -0,0 +1,10 @@
+/* Copyright (c) 2006 Brandon Aaron (http://brandonaaron.net)
+ * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php) 
+ * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
+ *
+ * $LastChangedDate: 2007-07-21 18:45:56 -0500 (Sat, 21 Jul 2007) $
+ * $Rev: 2447 $
+ *
+ * Version 2.1.1
+ */
+(function($){$.fn.bgIframe=$.fn.bgiframe=function(s){if($.browser.msie&&/6.0/.test(navigator.userAgent)){s=$.extend({top:'auto',left:'auto',width:'auto',height:'auto',opacity:true,src:'javascript:false;'},s||{});var prop=function(n){return n&&n.constructor==Number?n+'px':n;},html='<iframe class="bgiframe"frameborder="0"tabindex="-1"src="'+s.src+'"'+'style="display:block;position:absolute;z-index:-1;'+(s.opacity!==false?'filter:Alpha(Opacity=\'0\');':'')+'top:'+(s.top=='auto'?'expression(((parseInt(this.parentNode.currentStyle.borderTopWidth)||0)*-1)+\'px\')':prop(s.top))+';'+'left:'+(s.left=='auto'?'expression(((parseInt(this.parentNode.currentStyle.borderLeftWidth)||0)*-1)+\'px\')':prop(s.left))+';'+'width:'+(s.width=='auto'?'expression(this.parentNode.offsetWidth+\'px\')':prop(s.width))+';'+'height:'+(s.height=='auto'?'expression(this.parentNode.offsetHeight+\'px\')':prop(s.height))+';'+'"/>';return this.each(function(){if($('> iframe.bgiframe',this).length==0)this.insertBefore(document.createElement(html),this.firstChild);});}return this;};})(jQuery);
\ No newline at end of file
diff --git a/tests/unit/dialog/dialog.html b/tests/unit/dialog/dialog.html
index 5b23bc885..5819a63d7 100644
--- a/tests/unit/dialog/dialog.html
+++ b/tests/unit/dialog/dialog.html
@@ -4,13 +4,13 @@
 	<title>jQuery UI Dialog Test Suite</title>
 
 	<script type="text/javascript" src="../../../jquery-1.3.2.js"></script>
+	<script type="text/javascript" src="../../../external/jquery.bgiframe-2.1.1.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.core.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.widget.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.mouse.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.draggable.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.position.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.resizable.js"></script>
-	<script type="text/javascript" src="../../../ui/jquery.ui.stackfix.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.dialog.js"></script>
 
 	<link   type="text/css"       href="../testsuite.css" rel="stylesheet" />
diff --git a/tests/unit/dialog/dialog_defaults.js b/tests/unit/dialog/dialog_defaults.js
index 33da934fd..9607bf194 100644
--- a/tests/unit/dialog/dialog_defaults.js
+++ b/tests/unit/dialog/dialog_defaults.js
@@ -4,6 +4,7 @@
 
 var dialog_defaults = {
 	autoOpen: true,
+	bgiframe: false,
 	buttons: {},
 	closeOnEscape: true,
 	closeText: 'close',
@@ -21,7 +22,6 @@ var dialog_defaults = {
 	resizable: true,
 	show: null,
 	stack: true,
-	stackfix: false,
 	title: '',
 	width: 300,
 	zIndex: 1000
diff --git a/tests/visual/dialog/default.html b/tests/visual/dialog/default.html
index d71e54d0c..d7cd8e839 100644
--- a/tests/visual/dialog/default.html
+++ b/tests/visual/dialog/default.html
@@ -5,12 +5,12 @@
 	<link rel="stylesheet" href="../visual.css" type="text/css" />
 	<link rel="stylesheet" href="../../../themes/base/ui.all.css" type="text/css">
 	<script type="text/javascript" src="../../../jquery-1.3.2.js"></script>
+	<script type="text/javascript" src="../../../external/jquery.bgiframe-2.1.1.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.core.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.widget.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.draggable.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.position.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.resizable.js"></script>
-	<script type="text/javascript" src="../../../ui/jquery.ui.stackfix.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.dialog.js"></script>
 	<script type="text/javascript">
 	$(function() {
diff --git a/tests/visual/dialog/dialog.html b/tests/visual/dialog/dialog.html
index 551cb0e8c..09e8ce34c 100644
--- a/tests/visual/dialog/dialog.html
+++ b/tests/visual/dialog/dialog.html
@@ -5,12 +5,12 @@
 	<link rel="stylesheet" href="../all.css" type="text/css">
 	<link rel="stylesheet" href="../../../themes/base/ui.all.css" type="text/css">
 	<script type="text/javascript" src="../../../jquery-1.3.2.js"></script>
+	<script type="text/javascript" src="../../../external/jquery.bgiframe-2.1.1.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.core.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.widget.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.draggable.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.position.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.resizable.js"></script>
-	<script type="text/javascript" src="../../../ui/jquery.ui.stackfix.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.dialog.js"></script>
 	<script type="text/javascript">
 	$(function() {
diff --git a/tests/visual/dialog/dialog_on_page_with_large_dom.html b/tests/visual/dialog/dialog_on_page_with_large_dom.html
index 08d667b0d..3bbb82041 100644
--- a/tests/visual/dialog/dialog_on_page_with_large_dom.html
+++ b/tests/visual/dialog/dialog_on_page_with_large_dom.html
@@ -5,12 +5,12 @@
 	<link rel="stylesheet" href="../visual.css" type="text/css" />
 	<link rel="stylesheet" href="../../../themes/base/ui.all.css" type="text/css">
 	<script type="text/javascript" src="../../../jquery-1.3.2.js"></script>
+	<script type="text/javascript" src="../../../external/jquery.bgiframe-2.1.1.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.core.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.widget.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.draggable.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.position.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.resizable.js"></script>
-	<script type="text/javascript" src="../../../ui/jquery.ui.stackfix.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.dialog.js"></script>
 	<script type="text/javascript">
 	$(function() {
diff --git a/tests/visual/dialog/dialog_on_page_with_scrollbars.html b/tests/visual/dialog/dialog_on_page_with_scrollbars.html
index be274e201..53ae95a7f 100644
--- a/tests/visual/dialog/dialog_on_page_with_scrollbars.html
+++ b/tests/visual/dialog/dialog_on_page_with_scrollbars.html
@@ -5,12 +5,12 @@
 	<link rel="stylesheet" href="../visual.css" type="text/css" />
 	<link rel="stylesheet" href="../../../themes/base/ui.all.css" type="text/css">
 	<script type="text/javascript" src="../../../jquery-1.3.2.js"></script>
+	<script type="text/javascript" src="../../../external/jquery.bgiframe-2.1.1.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.core.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.widget.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.draggable.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.position.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.resizable.js"></script>
-	<script type="text/javascript" src="../../../ui/jquery.ui.stackfix.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.dialog.js"></script>
 	<script type="text/javascript">
 	$(function() {
diff --git a/tests/visual/dialog/dialog_option_buttons_OK_Cancel.html b/tests/visual/dialog/dialog_option_buttons_OK_Cancel.html
index bdc63f0dd..637fccb6a 100644
--- a/tests/visual/dialog/dialog_option_buttons_OK_Cancel.html
+++ b/tests/visual/dialog/dialog_option_buttons_OK_Cancel.html
@@ -5,12 +5,12 @@
 	<link rel="stylesheet" href="../visual.css" type="text/css" />
 	<link rel="stylesheet" href="../../../themes/base/ui.all.css" type="text/css">
 	<script type="text/javascript" src="../../../jquery-1.3.2.js"></script>
+	<script type="text/javascript" src="../../../external/jquery.bgiframe-2.1.1.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.core.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.widget.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.draggable.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.position.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.resizable.js"></script>
-	<script type="text/javascript" src="../../../ui/jquery.ui.stackfix.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.dialog.js"></script>
 	<script type="text/javascript">
 	$(function() {
diff --git a/tests/visual/dialog/dialog_option_closeOnEscape_false.html b/tests/visual/dialog/dialog_option_closeOnEscape_false.html
index 95aaba4d8..14d6da5f4 100644
--- a/tests/visual/dialog/dialog_option_closeOnEscape_false.html
+++ b/tests/visual/dialog/dialog_option_closeOnEscape_false.html
@@ -5,12 +5,12 @@
 	<link rel="stylesheet" href="../visual.css" type="text/css" />
 	<link rel="stylesheet" href="../../../themes/base/ui.all.css" type="text/css">
 	<script type="text/javascript" src="../../../jquery-1.3.2.js"></script>
+	<script type="text/javascript" src="../../../external/jquery.bgiframe-2.1.1.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.core.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.widget.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.draggable.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.position.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.resizable.js"></script>
-	<script type="text/javascript" src="../../../ui/jquery.ui.stackfix.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.dialog.js"></script>
 	<script type="text/javascript">
 	$(function() {
diff --git a/tests/visual/dialog/dialog_option_closeOnEscape_true.html b/tests/visual/dialog/dialog_option_closeOnEscape_true.html
index 31f873f3b..a0bb89edd 100644
--- a/tests/visual/dialog/dialog_option_closeOnEscape_true.html
+++ b/tests/visual/dialog/dialog_option_closeOnEscape_true.html
@@ -5,12 +5,12 @@
 	<link rel="stylesheet" href="../visual.css" type="text/css" />
 	<link rel="stylesheet" href="../../../themes/base/ui.all.css" type="text/css">
 	<script type="text/javascript" src="../../../jquery-1.3.2.js"></script>
+	<script type="text/javascript" src="../../../external/jquery.bgiframe-2.1.1.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.core.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.widget.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.draggable.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.position.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.resizable.js"></script>
-	<script type="text/javascript" src="../../../ui/jquery.ui.stackfix.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.dialog.js"></script>
 	<script type="text/javascript">
 	$(function() {
diff --git a/tests/visual/dialog/dialog_option_modal_false.html b/tests/visual/dialog/dialog_option_modal_false.html
index 45dad2fc3..2c7b5fc19 100644
--- a/tests/visual/dialog/dialog_option_modal_false.html
+++ b/tests/visual/dialog/dialog_option_modal_false.html
@@ -5,12 +5,12 @@
 	<link rel="stylesheet" href="../visual.css" type="text/css" />
 	<link rel="stylesheet" href="../../../themes/base/ui.all.css" type="text/css">
 	<script type="text/javascript" src="../../../jquery-1.3.2.js"></script>
+	<script type="text/javascript" src="../../../external/jquery.bgiframe-2.1.1.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.core.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.widget.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.draggable.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.position.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.resizable.js"></script>
-	<script type="text/javascript" src="../../../ui/jquery.ui.stackfix.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.dialog.js"></script>
 	<script type="text/javascript">
 	$(function() {
diff --git a/tests/visual/dialog/dialog_option_modal_true.html b/tests/visual/dialog/dialog_option_modal_true.html
index b6e10e0d0..2218f132d 100644
--- a/tests/visual/dialog/dialog_option_modal_true.html
+++ b/tests/visual/dialog/dialog_option_modal_true.html
@@ -5,12 +5,12 @@
 	<link rel="stylesheet" href="../visual.css" type="text/css" />
 	<link rel="stylesheet" href="../../../themes/base/ui.all.css" type="text/css">
 	<script type="text/javascript" src="../../../jquery-1.3.2.js"></script>
+	<script type="text/javascript" src="../../../external/jquery.bgiframe-2.1.1.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.core.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.widget.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.draggable.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.position.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.resizable.js"></script>
-	<script type="text/javascript" src="../../../ui/jquery.ui.stackfix.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.dialog.js"></script>
 	<script type="text/javascript">
 	$(function() {
diff --git a/tests/visual/dialog/dialog_ticket_4826.html b/tests/visual/dialog/dialog_ticket_4826.html
index 10f7b05a3..2906a766c 100644
--- a/tests/visual/dialog/dialog_ticket_4826.html
+++ b/tests/visual/dialog/dialog_ticket_4826.html
@@ -5,12 +5,12 @@
 	<link rel="stylesheet" href="../visual.css" type="text/css" />
 	<link rel="stylesheet" href="../../../themes/base/ui.all.css" type="text/css">
 	<script type="text/javascript" src="../../../jquery-1.3.2.js"></script>
+	<script type="text/javascript" src="../../../external/jquery.bgiframe-2.1.1.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.core.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.widget.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.draggable.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.position.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.resizable.js"></script>
-	<script type="text/javascript" src="../../../ui/jquery.ui.stackfix.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.dialog.js"></script>
 	<script type="text/javascript">
 	$(function() {
diff --git a/ui/jquery.ui.dialog.js b/ui/jquery.ui.dialog.js
index be4842e8a..6635499ec 100644
--- a/ui/jquery.ui.dialog.js
+++ b/ui/jquery.ui.dialog.js
@@ -27,7 +27,7 @@ var uiDialogClasses =
 $.widget("ui.dialog", {
 	options: {
 		autoOpen: true,
-		stackfix: false,
+		bgiframe: false,
 		buttons: {},
 		closeOnEscape: true,
 		closeText: 'close',
@@ -146,7 +146,7 @@ $.widget("ui.dialog", {
 		self._createButtons(options.buttons);
 		self._isOpen = false;
 
-		(options.stackfix && $.fn.stackfix && uiDialog.stackfix());
+		(options.bgiframe && $.fn.bgiframe && uiDialog.bgiframe());
 		(options.autoOpen && self.open());
 	},
 
@@ -599,7 +599,7 @@ $.extend($.ui.dialog.overlay, {
 				height: this.height()
 			});
 
-		(dialog.options.stackfix && $.fn.stackfix && $el.stackfix());
+		(dialog.options.bgiframe && $.fn.bgiframe && $el.bgiframe());
 
 		this.instances.push($el);
 		return $el;
diff --git a/ui/jquery.ui.position.js b/ui/jquery.ui.position.js
index eb632fcce..b9587387c 100644
--- a/ui/jquery.ui.position.js
+++ b/ui/jquery.ui.position.js
@@ -140,7 +140,7 @@ $.fn.position = function(options) {
 				}));
 		});
 
-		(options.stackfix !== false && $.fn.stackfix && elem.stackfix());
+		(options.bgiframe !== false && $.fn.bgiframe && elem.bgiframe());
 		elem.offset($.extend(position, { using: options.using }));
 	});
 };
diff --git a/ui/jquery.ui.stackfix.js b/ui/jquery.ui.stackfix.js
deleted file mode 100644
index 5631dc536..000000000
--- a/ui/jquery.ui.stackfix.js
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * jQuery UI Stackfix @VERSION
- *
- * Copyright (c) 2009 AUTHORS.txt (http://jqueryui.com/about)
- * Dual licensed under the MIT (MIT-LICENSE.txt)
- * and GPL (GPL-LICENSE.txt) licenses.
- *
- * http://docs.jquery.com/UI/Stackfix
- */
-
-(function($){
-
-// This is only for IE6
-$.fn.stackfix = $.browser.msie && /msie 6\.0/i.test(navigator.userAgent) ? function(s) {
-	s = $.extend({
-		top     : 'auto', // auto == .currentStyle.borderTopWidth
-		left    : 'auto', // auto == .currentStyle.borderLeftWidth
-		width   : 'auto', // auto == offsetWidth
-		height  : 'auto', // auto == offsetHeight
-		opacity : true,
-		src     : 'javascript:false;'
-	}, s || {});
-	var prop = function(n){return n&&n.constructor==Number?n+'px':n;},
-	    html = '<iframe class="ui-stackfix" frameborder="0" tabindex="-1" src="'+s.src+'" '+
-	               'style="display:block;position:absolute;z-index:-1;'+
-		               (s.opacity !== false?'filter:Alpha(Opacity=\'0\');':'')+
-				       'top:'+(s.top=='auto'?'expression(((parseInt(this.parentNode.currentStyle.borderTopWidth)||0)*-1)+\'px\')':prop(s.top))+';'+
-				       'left:'+(s.left=='auto'?'expression(((parseInt(this.parentNode.currentStyle.borderLeftWidth)||0)*-1)+\'px\')':prop(s.left))+';'+
-				       'width:'+(s.width=='auto'?'expression(this.parentNode.offsetWidth+\'px\')':prop(s.width))+';'+
-				       'height:'+(s.height=='auto'?'expression(this.parentNode.offsetHeight+\'px\')':prop(s.height))+';'+
-				'"/>';
-	return this.each(function() {
-		if ( $('> iframe.ui-stackfix', this).length == 0 )
-			this.insertBefore( document.createElement(html), this.firstChild );
-	});
-} : function() {
-	return this;
-};
-
-})(jQuery);
\ No newline at end of file