var is = new Object();
	is.IE = (navigator.appName.indexOf("Microsoft Internet Explorer") != -1) ? 1 : 0;
	is.NS = (navigator.appName.indexOf("Netscape") != -1) ? 1 : 0;
	is.Mac = (navigator.userAgent.indexOf("Mac") != -1) ? 1 : 0;
	is.Win = (navigator.userAgent.indexOf("Win") != -1) ? 1 : 0;
	is.NS4 = (document.layers) ? 1 : 0;
	
	var CSSextension = (is.NS4) ? ".ns.css" : ".css";
	document.write("<link rel='stylesheet' type='text/css'  href='/css/global" + CSSextension + "'>");
	//alert(CSSextension)