browserName = navigator.appName;
     browserVer = parseInt(navigator.appVersion);
             version = "n2";
                         if (browserName == "Netscape" && browserVer >= 3) version = "n3";
                         if (browserName == "Microsoft Internet Explorer" && browserVer >= 4) version = "n3";               
             if (version == "n3") {
toc1on = new Image();
toc1on.src = "images/nav1on.gif";
toc2on = new Image();
toc2on.src = "images/nav2on.gif";
toc3on = new Image();
toc3on.src = "images/nav3on.gif";
toc4on = new Image();
toc4on.src = "images/nav4on.gif";
toc5on = new Image();
toc5on.src = "images/nav5on.gif";
toc6on = new Image();
toc6on.src = "images/nav6on.gif";
toc7on = new Image();
toc7on.src = "images/nav7on.gif";
toc8on = new Image();
toc8on.src = "images/nav8on.gif";
toc1off = new Image();
toc1off.src = "images/nav1off.gif";
toc2off = new Image();
toc2off.src = "images/nav2off.gif";
toc3off = new Image();
toc3off.src = "images/nav3off.gif";
toc4off = new Image();
toc4off.src = "images/nav4off.gif";
toc5off = new Image();
toc5off.src = "images/nav5off.gif";
toc6off = new Image();
toc6off.src = "images/nav6off.gif";
toc7off = new Image();
toc7off.src = "images/nav7off.gif";
toc8off = new Image();
toc8off.src = "images/nav8off.gif";
             }
     function img_act(imgName) {
             if (version == "n3") {
             imgOn = eval(imgName + "on.src");
             document [imgName].src = imgOn;
             }
     }
     function img_inact(imgName) {
             if (version == "n3") {
             imgOff = eval(imgName + "off.src");
             document [imgName].src = imgOff;
             }
     }