diff --git a/htdocs/lang/de/ocstyle/main.tpl.php b/htdocs/lang/de/ocstyle/main.tpl.php
index e7228284..a89f6b81 100644
--- a/htdocs/lang/de/ocstyle/main.tpl.php
+++ b/htdocs/lang/de/ocstyle/main.tpl.php
@@ -62,7 +62,7 @@
 		<meta http-equiv="gallerimg" content="no" />
 		<meta http-equiv="cache-control" content="no-cache" />
 		<link rel="SHORTCUT ICON" href="favicon.ico">
-		<link rel="stylesheet" type="text/css" media="screen,projection" href="resource2/{style}/css/style_screen.css">
+		<link rel="stylesheet" type="text/css" media="screen,projection" href="resource2/{style}/css/style_screen.css?ft={screen_css_time}">
       <script type="text/javascript">
 				<!--
 <?php
@@ -92,7 +92,7 @@
 					}
 				//-->
       </script>
-  	<link rel="stylesheet" type="text/css" media="print" href="resource2/{style}/css/style_print.css">
+		<link rel="stylesheet" type="text/css" media="print" href="resource2/{style}/css/style_print.css?ft={print_css_time}">
 		<script type="text/javascript" src="resource2/{style}/js/enlargeit.js"></script>
 		{htmlheaders}
 	</head>
diff --git a/htdocs/lib/common.inc.php b/htdocs/lib/common.inc.php
index 51fc1241..7c4af2d8 100644
--- a/htdocs/lib/common.inc.php
+++ b/htdocs/lib/common.inc.php
@@ -432,7 +432,7 @@ function __autoload($class_name)
 	function tpl_BuildTemplate($dbdisconnect=true)
 	{
 		//template handling vars
-		global $stylepath, $tplname, $vars, $langpath, $locale, $opt, $oc_nodeid;
+		global $style, $stylepath, $tplname, $vars, $langpath, $locale, $opt, $oc_nodeid;
 		//language specific expression
 		global $error_pagenotexist;
 		//only for debbuging
@@ -440,6 +440,9 @@ function __autoload($class_name)
 		// country dropdown
 		global $tpl_usercountries;
 
+		tpl_set_var('screen_css_time',filemtime($opt['rootpath'] . "resource2/" . $style . "/css/style_screen.css"));
+		tpl_set_var('print_css_time',filemtime($opt['rootpath'] . "resource2/" . $style . "/css/style_print.css"));
+
 		if (isset($bScriptExecution))
 		{
 			$bScriptExecution->Stop();
diff --git a/htdocs/lib2/OcSmarty.class.php b/htdocs/lib2/OcSmarty.class.php
index 700f0255..53e6f43f 100644
--- a/htdocs/lib2/OcSmarty.class.php
+++ b/htdocs/lib2/OcSmarty.class.php
@@ -237,6 +237,9 @@ class OcSmarty extends Smarty
 		$this->bench->stop();
 		$this->assign('sys_runtime', $this->bench->diff());
 
+		$this->assign('screen_css_time',filemtime($opt['rootpath'] . "resource2/" . $opt['template']['style'] . "/css/style_screen.css"));
+		$this->assign('print_css_time',filemtime($opt['rootpath'] . "resource2/" . $opt['template']['style'] . "/css/style_print.css"));
+
 		// check if the template is compiled
 		// if not, check if translation works correct
     $_smarty_compile_path = $this->_get_compile_path($this->name);
diff --git a/htdocs/templates2/ocstyle/sys_main.tpl b/htdocs/templates2/ocstyle/sys_main.tpl
index 176a1787..9a64cbc2 100644
--- a/htdocs/templates2/ocstyle/sys_main.tpl
+++ b/htdocs/templates2/ocstyle/sys_main.tpl
@@ -18,8 +18,8 @@
 		<meta http-equiv="gallerimg" content="no" />
 		<meta http-equiv="cache-control" content="no-cache" />
 		<link rel="SHORTCUT ICON" href="favicon.ico">
-		<link rel="stylesheet" type="text/css" media="screen,projection" href="resource2/{$opt.template.style}/css/style_screen.css">
-		<link rel="stylesheet" type="text/css" media="print" href="resource2/{$opt.template.style}/css/style_print.css">
+		<link rel="stylesheet" type="text/css" media="screen,projection" href="resource2/{$opt.template.style}/css/style_screen.css?ft={$screen_css_time}">
+		<link rel="stylesheet" type="text/css" media="print" href="resource2/{$opt.template.style}/css/style_print.css?ft={$print_css_time}">
 		{literal}
 			<script type="text/javascript">
 			<!--