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="css/safari.css" type="text/css" />');
}