function detectMacXFF() {
  var userAgent = navigator.userAgent.toLowerCase();
  if (userAgent.indexOf('mac') != -1 && userAgent.indexOf('firefox')!=-1) {
   document.write("<link rel='stylesheet' href='css/ff-fix.css' type='text/css' media='screen' />");

  }
 else if (userAgent.indexOf('mac') != -1 && userAgent.indexOf('safari')!=-1) {
	document.write("<link rel='stylesheet' href='css/safari-fix.css' type='text/css' media='screen' />");
 }
  
}