ie4 = ((navigator.appName == "Microsoft Internet Explorer") &&
           (parseInt(navigator.appVersion) >= 4 ))
                        
ns4 = ((navigator.appName == "Netscape") &&
           (parseInt(navigator.appVersion) >= 4 ))
           
if(ie4) {
        document.write("<link rel=stylesheet type=\"text/css\" href=\"styles.css\">");
} else {
		document.write("<link rel=stylesheet type=\"text/css\" href=\"stylesns.css\">");
}