Index: wp-admin/css/ie.dev.css
===================================================================
--- wp-admin/css/ie.dev.css	(revision 16392)
+++ wp-admin/css/ie.dev.css	(working copy)
@@ -379,7 +379,7 @@
 	width: 99%;
 }
 
-#wp_inactive_widgets {
+#sidebar-wp_inactive_widgets {
 	padding-bottom: 8px;
 }
 
@@ -408,7 +408,7 @@
 }
 
 .widget-liquid-right .widget,
-#wp_inactive_widgets .widget {
+#sidebar-wp_inactive_widgets .widget {
 	position: relative;
 }
 
Index: wp-admin/css/widgets.dev.css
===================================================================
--- wp-admin/css/widgets.dev.css	(revision 16392)
+++ wp-admin/css/widgets.dev.css	(working copy)
@@ -28,7 +28,7 @@
 }
 
 .widget-liquid-right .widget,
-#wp_inactive_widgets .widget,
+#sidebar-wp_inactive_widgets .widget,
 .widget-liquid-right .sidebar-description {
 	width: 250px;
 	margin: 0 auto 20px;
@@ -39,7 +39,7 @@
 	margin-bottom: 10px;
 }
 
-#wp_inactive_widgets .widget {
+#sidebar-wp_inactive_widgets .widget {
 	margin: 0 10px 20px;
 	float: left;
 }
@@ -108,7 +108,7 @@
 	padding: 7px 5px 0;
 }
 
-#wp_inactive_widgets {
+#sidebar-wp_inactive_widgets {
 	padding: 5px 5px 0;
 }
 
@@ -140,7 +140,7 @@
 	width: 250px;
 }
 
-#wp_inactive_widgets .widget-placeholder {
+#sidebar-wp_inactive_widgets .widget-placeholder {
 	margin: 0 10px 20px;
 	float: left;
 }
@@ -274,7 +274,7 @@
 
 #available-widgets .widget-control-edit .add,
 #widgets-right .widget-control-edit .edit,
-#wp_inactive_widgets .widget-control-edit .edit {
+#sidebar-wp_inactive_widgets .widget-control-edit .edit {
 	display: inline;
 }
 
Index: wp-admin/includes/widgets.php
===================================================================
--- wp-admin/includes/widgets.php	(revision 16392)
+++ wp-admin/includes/widgets.php	(working copy)
@@ -67,7 +67,7 @@
 function wp_list_widget_controls( $sidebar ) {
 	add_filter( 'dynamic_sidebar_params', 'wp_list_widget_controls_dynamic_sidebar' );
 
-	echo "<div id='$sidebar' class='widgets-sortables'>\n";
+	echo "<div id='sidebar-$sidebar' class='widgets-sortables'>\n";
 
 	$description = wp_sidebar_description( $sidebar );
 
Index: wp-admin/js/widgets.dev.js
===================================================================
--- wp-admin/js/widgets.dev.js	(revision 16392)
+++ wp-admin/js/widgets.dev.js	(working copy)
@@ -21,7 +21,7 @@
 			$(this).siblings('.widget-holder').parent().toggleClass('closed');
 		});
 
-		sidebars.not('#wp_inactive_widgets').each(function(){
+		sidebars.not('#sidebar-wp_inactive_widgets').each(function(){
 			var h = 50, H = $(this).children('.widget').length;
 			h = h + parseInt(H * 48, 10);
 			$(this).css( 'minHeight', h + 'px' );
@@ -175,7 +175,7 @@
 		};
 
 		$('div.widgets-sortables').each( function() {
-			a['sidebars[' + $(this).attr('id') + ']'] = $(this).sortable('toArray').join(',');
+			a['sidebars[' + wpWidgets.stripSidebarId($(this).attr('id')) + ']'] = $(this).sortable('toArray').join(','); //
 		});
 
 		$.post( ajaxurl, a, function() {
@@ -186,7 +186,7 @@
 	},
 
 	save : function(widget, del, animate, order) {
-		var sb = widget.closest('div.widgets-sortables').attr('id'), data = widget.find('form').serialize(), a;
+		var sb = wpWidgets.stripSidebarId(widget.closest('div.widgets-sortables').attr('id')), data = widget.find('form').serialize(), a;
 		widget = $(widget);
 		$('.ajax-feedback', widget).css('visibility', 'visible');
 
@@ -246,7 +246,7 @@
 	},
 
 	resize : function() {
-		$('div.widgets-sortables').not('#wp_inactive_widgets').each(function(){
+		$('div.widgets-sortables').not('#sidebar-wp_inactive_widgets').each(function(){
 			var h = 50, H = $(this).children('.widget').length;
 			h = h + parseInt(H * 48, 10);
 			$(this).css( 'minHeight', h + 'px' );
@@ -273,6 +273,10 @@
 		widget.children('.widget-inside').slideUp('fast', function(){
 			widget.css({'width':'','marginLeft':''});
 		});
+	},
+	
+	stripSidebarId : function(id) {
+		return id.replace(/sidebar-/, '');
 	}
 };