browser = navigator.appName;
appVer = parseInt(navigator.appVersion);

ie = "Microsoft Internet Explorer";
ns = "Netscape";

if (navigator.appVersion.indexOf("Macintosh") != -1) {
 isMac = true;
}else {
 isMac = false;
}

//Uses getElementById() method to see is browser is outdated (NS4 doesn't have this method

if (!document.getElementById) { 
 oldBrowser = true;
 top.location.replace('/upgradeBrowser.asp'); 
}