diff --git a/wp-admin/admin-header.php b/wp-admin/admin-header.php
index e01054758..c03e4d821 100644
--- a/wp-admin/admin-header.php
+++ b/wp-admin/admin-header.php
@@ -17,10 +17,7 @@ get_admin_page_title();
 <head>
 <meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=<?php echo get_option('blog_charset'); ?>" />
 <title><?php bloginfo('name') ?> &rsaquo; <?php echo wp_specialchars( strip_tags( $title ) ); ?> &#8212; WordPress</title>
-<link rel="stylesheet" href="<?php echo get_option('siteurl') ?>/wp-admin/wp-admin.css?version=<?php bloginfo('version'); ?>" type="text/css" />
-<?php if ( ('rtl' == $wp_locale->text_direction) ) : ?>
-<link rel="stylesheet" href="<?php echo get_option('siteurl') ?>/wp-admin/rtl.css?version=<?php bloginfo('version'); ?>" type="text/css" />
-<?php endif; ?> 
+<?php wp_admin_css(); ?> 
 <script type="text/javascript">
 //<![CDATA[
 function addLoadEvent(func) {if ( typeof wpOnload!='function'){wpOnload=func;}else{ var oldonload=wpOnload;wpOnload=function(){oldonload();func();}}}
diff --git a/wp-admin/bookmarklet.php b/wp-admin/bookmarklet.php
index e84b5d9d0..fca99e1f6 100644
--- a/wp-admin/bookmarklet.php
+++ b/wp-admin/bookmarklet.php
@@ -51,7 +51,7 @@ if ( !empty($content) ) {
 <head>
 <title><?php bloginfo('name') ?> &rsaquo; Bookmarklet &#8212; WordPress</title>
 <meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=<?php echo get_option('blog_charset'); ?>" />
-<link rel="stylesheet" href="wp-admin.css" type="text/css" />
+<?php wp_admin_css(); ?>
 
 <style type="text/css">
 <!--
diff --git a/wp-admin/includes/upload.php b/wp-admin/includes/upload.php
index 3b4103b85..b1fa9e899 100644
--- a/wp-admin/includes/upload.php
+++ b/wp-admin/includes/upload.php
@@ -339,10 +339,7 @@ add_action( 'upload_files_browse', 'wp_upload_tab_browse_action' );
 add_action( 'upload_files_browse-all', 'wp_upload_tab_browse_action' );
 
 function wp_upload_admin_head() {
-	global $wp_locale;
-	echo "<link rel='stylesheet' href='" . get_bloginfo('wpurl') . '/wp-admin/css/upload.css?version=' . get_bloginfo('version') . "a' type='text/css' />\n";
-	if ( 'rtl' == $wp_locale->text_direction )
-		echo "<link rel='stylesheet' href='" . get_bloginfo('wpurl') . '/wp-admin/css/upload-rtl.css?version=' . get_bloginfo('version') . "a' type='text/css' />\n";
+	wp_admin_css( 'css/upload' );
 	if ( 'inline' == @$_GET['style'] ) {
 		echo "<style type='text/css' media='screen'>\n";
 		echo "\t#upload-menu { position: absolute; z-index: 2; }\n";
diff --git a/wp-admin/install.php b/wp-admin/install.php
index de64f095b..11d064f02 100644
--- a/wp-admin/install.php
+++ b/wp-admin/install.php
@@ -19,10 +19,7 @@ header( 'Content-Type: text/html; charset=utf-8' );
 <head>
 	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 	<title><?php _e('WordPress &rsaquo; Installation'); ?></title>
-	<link rel="stylesheet" href="css/install.css?version=<?php bloginfo('version'); ?>" type="text/css" />
-	<?php if ( ('rtl' == $wp_locale->text_direction) ) : ?>
-	<link rel="stylesheet" href="css/install-rtl.css?version=<?php bloginfo('version'); ?>" type="text/css" />
-	<?php endif; ?>
+	<?php wp_admin_css( 'css/install' ); ?>
 </head>
 <body>
 <h1 id="logo"><img alt="WordPress" src="images/wordpress-logo.png" /></h1>
diff --git a/wp-admin/sidebar.php b/wp-admin/sidebar.php
index 010a2e28c..4b160aff0 100644
--- a/wp-admin/sidebar.php
+++ b/wp-admin/sidebar.php
@@ -13,7 +13,7 @@ if ('b' == $_GET['a']) {
 <head>
 <title>WordPress &#8250; Posted</title>
 <meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=UTF-8" />
-<link rel="stylesheet" href="wp-admin.css" type="text/css" />
+<?php wp_admin_css(); ?>
 </head>
 <body>
 	<p>Posted !</p>
@@ -28,7 +28,7 @@ if ('b' == $_GET['a']) {
 <head>
 <title>WordPress &#8250; Sidebar</title>
 <meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=<?php bloginfo('blog_charset'); ?>" />
-<link rel="stylesheet" href="wp-admin.css" type="text/css" />
+<?php wp_admin_css(); ?>
 <style type="text/css" media="screen">
 form {
 	padding: 3px;
diff --git a/wp-admin/upgrade.php b/wp-admin/upgrade.php
index f367f03b9..b7947961c 100644
--- a/wp-admin/upgrade.php
+++ b/wp-admin/upgrade.php
@@ -18,10 +18,7 @@ else
 <head>
 	<meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=<?php echo get_option('blog_charset'); ?>" />
 	<title><?php _e('WordPress &rsaquo; Upgrade'); ?></title>
-	<link rel="stylesheet" href="<?php echo get_option('siteurl') ?>/wp-admin/css/install.css?version=<?php bloginfo('version'); ?>" type="text/css" />
-	<?php if ( ('rtl' == $wp_locale->text_direction) ) : ?>
-	<link rel="stylesheet" href="<?php echo get_option('siteurl') ?>/wp-admin/css/install-rtl.css?version=<?php bloginfo('version'); ?>" type="text/css" />
-	<?php endif; ?>
+	<?php wp_admin_css( 'css/install' ); ?>
 </head>
 <body>
 <h1 id="logo"><img alt="WordPress" src="images/wordpress-logo.png" /></h1>
diff --git a/wp-admin/upload.php b/wp-admin/upload.php
index 1c9446c49..bfbd9fc63 100644
--- a/wp-admin/upload.php
+++ b/wp-admin/upload.php
@@ -63,10 +63,7 @@ if ( 'inline' == $style ) : ?>
 <head>
 <meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=<?php echo get_option('blog_charset'); ?>" />
 <title><?php bloginfo('name') ?> &rsaquo; <?php _e('Uploads'); ?> &#8212; WordPress</title>
-<link rel="stylesheet" href="<?php bloginfo( 'wpurl' ); ?>/wp-admin/wp-admin.css?version=<?php bloginfo('version'); ?>" type="text/css" />
-<?php if ( ('rtl' == $wp_locale->text_direction) ) : ?>
-<link rel="stylesheet" href="<?php bloginfo( 'wpurl' ); ?>/wp-admin/rtl.css?version=<?php bloginfo('version'); ?>" type="text/css" />
-<?php endif; ?> 
+<?php wp_admin_css(); ?>
 <script type="text/javascript">
 //<![CDATA[
 function addLoadEvent(func) {if ( typeof wpOnload!='function'){wpOnload=func;}else{ var oldonload=wpOnload;wpOnload=function(){oldonload();func();}}}
diff --git a/wp-admin/widgets.php b/wp-admin/widgets.php
index 44b3dcd0a..027fa835f 100644
--- a/wp-admin/widgets.php
+++ b/wp-admin/widgets.php
@@ -10,18 +10,13 @@ wp_enqueue_script('interface');
 function wp_widgets_admin_head() {
 	global $wp_registered_sidebars, $wp_registered_widgets, $wp_registered_widget_controls;
 ?>
-	<link rel="stylesheet" href="<?php bloginfo( 'wpurl' ); ?>/wp-admin/css/widgets.css?version=<?php bloginfo('version'); ?>" type="text/css" />
+	<?php wp_admin_css( 'css/widgets' ); ?>
 	<!--[if IE 7]>
 	<style type="text/css">
 		#palette { float: <?php echo ( get_bloginfo( 'text_direction' ) == 'rtl' ) ? 'right' : 'left'; ?>; }
 	</style>
 	<![endif]-->
 <?php
-	if ( get_bloginfo( 'text_direction' ) == 'rtl' ) { 
-?>
-	<link rel="stylesheet" href="<?php bloginfo( 'wpurl' ); ?>/wp-admin/css/widgets-rtl.css?version=<?php bloginfo('version'); ?>" type="text/css" />
-<?php
-	}
 
 	$cols = array();
 	foreach ( $wp_registered_sidebars as $index => $sidebar ) {
diff --git a/wp-includes/general-template.php b/wp-includes/general-template.php
index db171c52d..37dfba80e 100644
--- a/wp-includes/general-template.php
+++ b/wp-includes/general-template.php
@@ -1063,4 +1063,18 @@ function paginate_links( $args = '' ) {
 	endswitch;
 	return $r;
 }
+
+function wp_admin_css_uri( $file = 'wp-admin' ) {
+	$_file = add_query_arg( 'version', get_bloginfo( 'version' ), get_option( 'siteurl' ) . "/wp-admin/$file.css" );
+	return apply_filters( 'wp_admin_css_uri', $_file, $file );
+}
+
+function wp_admin_css( $file = 'wp-admin' ) {
+	echo apply_filters( 'wp_admin_css', "<link rel='stylesheet' href='" . wp_admin_css_uri( $file ) . "' type='text/css' />\n", $file );
+	if ( 'rtl' == get_bloginfo( 'text_direction' ) ) {
+		$rtl = ( 'wp-admin' == $file ) ? 'rtl' : "$file-rtl";
+		echo apply_filters( 'wp_admin_css', "<link rel='stylesheet' href='" . wp_admin_css_uri( $rtl ) . "' type='text/css' />\n", $rtl );
+	}
+}
+
 ?>
diff --git a/wp-includes/js/tinymce/wp-mce-help.php b/wp-includes/js/tinymce/wp-mce-help.php
index 6d5f1e4cf..09b9b35ec 100644
--- a/wp-includes/js/tinymce/wp-mce-help.php
+++ b/wp-includes/js/tinymce/wp-mce-help.php
@@ -6,10 +6,7 @@ header('Content-Type: text/html; charset=' . get_bloginfo('charset'));
 <head>
 <meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=<?php echo get_option('blog_charset'); ?>" />
 <title><?php _e('Rich Editor Help') ?></title>
-<link rel="stylesheet" href="<?php echo get_option('siteurl') ?>/wp-admin/wp-admin.css?version=<?php bloginfo('version'); ?>" type="text/css" />
-<?php if ( ('rtl' == $wp_locale->text_direction) ) : ?>
-<link rel="stylesheet" href="<?php echo get_option('siteurl') ?>/wp-admin/rtl.css?version=<?php bloginfo('version'); ?>" type="text/css" />
-<?php endif; ?> 
+<?php wp_admin_css(); ?>
 <style type="text/css">
 	#wphead {
 		padding-top: 5px;
@@ -183,4 +180,3 @@ header('Content-Type: text/html; charset=' . get_bloginfo('charset'));
 
 </body>
 </html>
-
diff --git a/wp-login.php b/wp-login.php
index ee5eb2e67..cdf45afa0 100644
--- a/wp-login.php
+++ b/wp-login.php
@@ -31,10 +31,7 @@ function login_header($title = 'Login', $message = '') {
 <head>
 	<title><?php bloginfo('name'); ?> &rsaquo; <?php echo $title; ?></title>
 	<meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=<?php bloginfo('charset'); ?>" />
-	<link rel="stylesheet" href="<?php bloginfo('wpurl'); ?>/wp-admin/wp-admin.css?version=<?php bloginfo('version'); ?>" type="text/css" />
-<?php if ( ('rtl' == $wp_locale->text_direction) ) : ?>
-	<link rel="stylesheet" href="<?php bloginfo('wpurl'); ?>/wp-admin/rtl.css?version=<?php bloginfo('version'); ?>" type="text/css" />
-<?php endif; ?>
+	<?php wp_admin_css(); ?>
 	<!--[if IE]><style type="text/css">#login h1 a { margin-top: 35px; } #login #login_error { margin-bottom: 10px; }</style><![endif]--><!-- Curse you, IE! -->
 	<script type="text/javascript">
 		function focusit() {
