var browserName = navigator.appName;
    var browserRealnum = navigator.appVersion;
    var browserParsed = browserRealnum.substring(0,4);

    if (browserParsed == "3.0 ") browserParsed = 3.0;

    if (browserName == "Netscape" && browserParsed < 5.0)
         var newWin = window.open("[url util/browser_netscape]","",'toolbar=0,scrollbars=0,menubar=0,directories=0,location=0,status=0,resizable=0,height=300,width=300');
    else if (browserName == "Microsoft Internet Explorer") {
        var ieVer = browserRealnum.substring(browserRealnum.indexOf("MSIE")+5,browserRealnum.indexOf("MSIE")+8);
        if (((browserName.indexOf("Mac") == 1) && ieVer < 4.0) || (ieVer < 5.0) ) {
               var newWin = window.open("[url util/browser_explorer]","",'toolbar=0,scrollbars=0,resizable=1,location=0,status=0,menubar=0,directories=0,width=310,height=300');
         }
    }