var strAppName = navigator.appName;
var intAppVersion = parseInt(navigator.appVersion);
var bIsNS4 = (strAppName == "Netscape" && intAppVersion >= 4.0 && intAppVersion < 5.0);
var bIsNS5 = (strAppName == "Netscape" && intAppVersion >= 5.0);
var bIsIE = (bIsNS4 == false && bIsNS5 == false);
//alert("AppName is: "+strAppName+"\nAppVersion is: "+intAppVersion);