function detectSafari() { 
if (navigator.appVersion.indexOf("Safari") != -1) 
   document.body.className += " safari"; 
   
   if ((navigator.userAgent.indexOf("Mac") != -1) && (navigator.userAgent.indexOf("Firefox") != -1)) {
	document.getElementsByTagName("body")[0].className += " ff-mac";
}
} 

if (window.addEventListener)
	window.addEventListener("load", detectSafari, false);