browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
if ((browserName == "Netscape" && browserVer >= 3) ||
(browserName == "Microsoft Internet Explorer" && browserVer >=4)) version =
"n3";
else version = "n2"
             if (version == "n3") {
             toc1on = new Image();
             toc1on.src = "../images/tocon_01.gif";
             toc2on = new Image();
             toc2on.src = "../images/tocon_02.gif";
             toc3on = new Image();
             toc3on.src = "../images/tocon_03.gif";
             toc4on = new Image();
             toc4on.src = "../images/tocon_04.gif";
             toc5on = new Image();
             toc5on.src = "../images/tocon_05.gif";
             home_toc1on = new Image();
             home_toc1on.src = "../images/home_tocon_01.gif";
             home_toc2on = new Image();
             home_toc2on.src = "../images/home_tocon_02.gif";
             home_toc3on = new Image();
             home_toc3on.src = "../images/home_tocon_03.gif";
             home_toc4on = new Image();
             home_toc4on.src = "../images/home_tocon_04.gif";
             home_toc5on = new Image();
             home_toc5on.src = "../images/home_tocon_05.gif";

             toc1off = new Image();
             toc1off.src = "../images/tocoff_01.gif";
             toc2off = new Image();
             toc2off.src = "../images/tocoff_02.gif";
             toc3off = new Image();
             toc3off.src = "../images/tocoff_03.gif";
             toc4off = new Image();
             toc4off.src = "../images/tocoff_04.gif";
             toc5off = new Image();
             toc5off.src = "../images/tocoff_05.gif";
             home_toc1off = new Image();
             home_toc1off.src = "../images/home_tocoff_01.gif";
             home_toc2off = new Image();
             home_toc2off.src = "../images/home_tocoff_02.gif";
             home_toc3off = new Image();
             home_toc3off.src = "../images/home_tocoff_03.gif";
             home_toc4off = new Image();
             home_toc4off.src = "../images/home_tocoff_04.gif";
             home_toc5off = new Image();
             home_toc5off.src = "../images/home_tocoff_05.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;
             }

     }