function css() {
agent = navigator.appName;
version = navigator.appVersion;
version = version.substr(0,5);
switch(agent) {
case "Microsoft Internet Explorer":
if (version.indexOf("4.0") != -1) {
document.write("");
} else {
alert("Please upgrade your version of Internet Explorer to view this site.");
window.open("http://www.microsoft.com/windows/ie/default.asp");
}
break;
case "Netscape":
if (version.indexOf("5.0") != -1)
document.write("");
else
document.write("");
break;
case "Opera":
document.write("");
break;
default:
document.write("");
}
}