browser_version= parseInt(navigator.appVersion);
browser_type = navigator.appName;

if (browser_type == "Microsoft Internet Explorer" && (browser_version >= 4)) {
document.write("<link href='wgnit.css' rel='stylesheet' type='text/css'/>");
}

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