diff --git a/wp-admin/js/set-post-thumbnail-handler.dev.js b/wp-admin/js/set-post-thumbnail-handler.dev.js
index a7e12eced9..00443b4329 100644
--- a/wp-admin/js/set-post-thumbnail-handler.dev.js
+++ b/wp-admin/js/set-post-thumbnail-handler.dev.js
@@ -5,7 +5,4 @@ function WPSetThumbnailID(id){
 	if ( jQuery('input[value=_thumbnail_id]').size() > 0 ) {
 		jQuery('#meta\\[' + jQuery('input[value=_thumbnail_id]').attr('id').match(/[0-9]+/) + '\\]\\[value\\]' ).text(id);
 	}
-}
-function WPCloseTB(){
-	tb_remove();
 }
\ No newline at end of file
diff --git a/wp-admin/js/set-post-thumbnail-handler.js b/wp-admin/js/set-post-thumbnail-handler.js
index 6dc36f6b41..27f1a44b4f 100644
--- a/wp-admin/js/set-post-thumbnail-handler.js
+++ b/wp-admin/js/set-post-thumbnail-handler.js
@@ -1 +1 @@
-function WPSetThumbnailHTML(html){jQuery("#postthumbnaildiv .inside").html(html)}function WPSetThumbnailID(id){if(jQuery("input[value=_thumbnail_id]").size()>0){jQuery("#meta\\["+jQuery("input[value=_thumbnail_id]").attr("id").match(/[0-9]+/)+"\\]\\[value\\]").text(id)}}function WPCloseTB(){tb_remove()};
\ No newline at end of file
+function WPSetThumbnailHTML(html){jQuery("#postthumbnaildiv .inside").html(html)}function WPSetThumbnailID(id){if(jQuery("input[value=_thumbnail_id]").size()>0){jQuery("#meta\\["+jQuery("input[value=_thumbnail_id]").attr("id").match(/[0-9]+/)+"\\]\\[value\\]").text(id)}};
\ No newline at end of file
diff --git a/wp-admin/js/set-post-thumbnail.dev.js b/wp-admin/js/set-post-thumbnail.dev.js
index 723c37771d..4362ef23b8 100644
--- a/wp-admin/js/set-post-thumbnail.dev.js
+++ b/wp-admin/js/set-post-thumbnail.dev.js
@@ -12,7 +12,6 @@ function WPSetAsThumbnail(id){
 			jQuery('#media-item-' + id + ' > a.wp-post-thumbnail').hide();
 			win.WPSetThumbnailID(id);
 			win.WPSetThumbnailHTML(str);
-			win.WPCloseTB();
 		}
 	}
 	);
diff --git a/wp-admin/js/set-post-thumbnail.js b/wp-admin/js/set-post-thumbnail.js
index cda94bf476..fef9fb8f41 100644
--- a/wp-admin/js/set-post-thumbnail.js
+++ b/wp-admin/js/set-post-thumbnail.js
@@ -1 +1 @@
-function WPSetAsThumbnail(id){jQuery("#media-item-"+id+" > a.wp-post-thumbnail").text(setPostThumbnailL10n.saving).attr("href","#");jQuery.post(ajaxurl,{action:"set-post-thumbnail",post_id:post_id,thumbnail_id:id,cookie:encodeURIComponent(document.cookie)},function(str){var win=window.dialogArguments||opener||parent||top;if(str=="0"){alert(setPostThumbnailL10n.error);win.cwsCloseTB()}else{jQuery("a.wp-post-thumbnail").text(setPostThumbnailL10n.setThumbnail);jQuery("#media-item-"+id+" > a.wp-post-thumbnail").hide();win.WPSetThumbnailID(id);win.WPSetThumbnailHTML(str);win.WPCloseTB()}})};
\ No newline at end of file
+function WPSetAsThumbnail(id){jQuery("#media-item-"+id+" > a.wp-post-thumbnail").text(setPostThumbnailL10n.saving).attr("href","#");jQuery.post(ajaxurl,{action:"set-post-thumbnail",post_id:post_id,thumbnail_id:id,cookie:encodeURIComponent(document.cookie)},function(str){var win=window.dialogArguments||opener||parent||top;if(str=="0"){alert(setPostThumbnailL10n.error);win.cwsCloseTB()}else{jQuery("a.wp-post-thumbnail").text(setPostThumbnailL10n.setThumbnail);jQuery("#media-item-"+id+" > a.wp-post-thumbnail").hide();win.WPSetThumbnailID(id);win.WPSetThumbnailHTML(str)}})};
\ No newline at end of file
diff --git a/wp-includes/script-loader.php b/wp-includes/script-loader.php
index 3741ee4a0f..b5dc216ef2 100644
--- a/wp-includes/script-loader.php
+++ b/wp-includes/script-loader.php
@@ -375,7 +375,7 @@ function wp_default_scripts( &$scripts ) {
 		$scripts->add( 'image-edit', "/wp-admin/js/image-edit$suffix.js", array('jquery', 'json2', 'imgareaselect'), '20090929' );
 		$scripts->add_data( 'image-edit', 'group', 1 );
 
-		$scripts->add( 'set-post-thumbnail', "/wp-admin/js/set-post-thumbnail$suffix.js", array( 'jquery' ), '20091005' );
+		$scripts->add( 'set-post-thumbnail', "/wp-admin/js/set-post-thumbnail$suffix.js", array( 'jquery' ), '20091014' );
 		$scripts->add_data( 'set-post-thumbnail', 'group', 1 );
 		$scripts->localize( 'set-post-thumbnail', 'setPostThumbnailL10n', array(
 			'setThumbnail' => __( 'Use for thumbnail' ),
@@ -383,7 +383,7 @@ function wp_default_scripts( &$scripts ) {
 			'error' => __( 'Could not set that as the thumbnail image. Try a different attachment.' )
 		) );
 
-		$scripts->add( 'set-post-thumbnail-handler', "/wp-admin/js/set-post-thumbnail-handler$suffix.js", array( 'jquery' ), '20091005' );
+		$scripts->add( 'set-post-thumbnail-handler', "/wp-admin/js/set-post-thumbnail-handler$suffix.js", array( 'jquery' ), '20091014' );
 		$scripts->add_data( 'set-post-thumbnail-handler', 'group', 1 );
 	
 	}