var bNameLong = navigator.appName;
var bVer = parseInt(navigator.appVersion);
var bName = bNameLong.substr(0,4);

if ((bVer == 4) && (bName == "Nets")) {
	document.write('<link rel="stylesheet" type="text/css" href="ns.css">');
}

else {
	document.write('<link rel="stylesheet" type="text/css" href="ie.css">');
}