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/ie.css'>");

	 break;

	 case "NSonPC":

	 document.write("<link rel=stylesheet type='text/css' href='css/ns.css'>");

	 break;

	 default:

	 document.write("<link rel=stylesheet type='text/css' href='css/default.css'>");

	 break;

	}