version = '0';
     var isMacIE = ( (navigator.userAgent.indexOf("IE 4") > -1) && (navigator.userAgent.indexOf("Mac")  > -1) );
     browserName = navigator.appName;           
     browserVer = parseInt(navigator.appVersion); 
        if (browserName == "Netscape" && browserVer >= 4)version = "n4";
        else if (browserName == "Microsoft Internet Explorer" && browserVer >= 4) version = "e4";