browserName = navigator.appName;
     browserVer = parseInt(navigator.appVersion);
             if (browserName == "Netscape" || browserVer >= 3) version = "n3";
             else version = "n2";

             if (version == "n3") {
             toc1on = new Image();
             toc1on.src = "images/icon_02a.gif";
             toc2on = new Image();
             toc2on.src = "images/icon_04a.gif";
             toc3on = new Image();
             toc3on.src = "images/icon_06a.gif";
             toc4on = new Image();
             toc4on.src = "images/icon_08a.gif";
             toc5on = new Image();
             toc5on.src = "images/icon_10a.gif";

             toc1off = new Image();
             toc1off.src = "images/icon_02.gif";
             toc2off = new Image();
             toc2off.src = "images/icon_04.gif";
             toc3off = new Image();
             toc3off.src = "images/icon_06.gif";
             toc4off = new Image();
             toc4off.src = "images/icon_08.gif";
             toc5off = new Image();
             toc5off.src = "images/icon_10.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;
             }
     }