system = (navigator.appVersion.indexOf("Mac") == -1) ? "PC" : "MAC";
browser = (navigator.appName.indexOf("Microsoft") == -1) ? "NS" : "IE";
BrowserOnSystem = browser + "on" + system;

switch (BrowserOnSystem) {
	 case "IEonPC":
	 document.write("<link rel=stylesheet type='text/css' href='css/pcie.css'>");
	 break;
	 case "NSonPC":
	 document.write("<link rel=stylesheet type='text/css' href='css/pcns.css'>");
	 break;
	 case "IEonMAC":
	 document.write("<link rel=stylesheet type='text/css' href='css/macie.css'>");
	 break;
	 case "NSonMAC":
	 document.write("<link rel=stylesheet type='text/css' href='css/macns.css'>");
	 break;
	 default:
	 document.write("<link rel=stylesheet type='text/css' href='css/pcie.css'>");
	 break;
}