function liOnMouseOver($li,$effect) {
if (navigator.appName=="Microsoft Internet Explorer")
   {
   	if($effect == 'over')
   	{
	     $li.style.backgroundImage = 'url(/fileadmin/images/li_right.png)';
   	} else {
   	     $li.style.backgroundImage = 'url()';
   	}
   }
}