function checkBrowserName(name){  
var agent = navigator.userAgent.toLowerCase();  
if (agent.indexOf(name.toLowerCase())>-1) {  
	return true;  
}  
 return false;  
 }   
 if(checkBrowserName('safari')){  
document.write('<link rel="stylesheet" href="fileadmin/templates/2009/css/safari.css" type="text/css" media="screen"  />'); 
}