browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
version = "old";
if (browserName == "Netscape" && browserVer >=3)
version = "new";
if (browserName == "Microsoft Internet Explorer" && browserVer >=4)
version = "new";
if (browserName == "Opera" && browserVer >=9)
version = "new";
if (version == "new"){

toc1off = new Image(189,43);
toc1off.src = "images/header_banner1.jpg";
toc1on = new Image(189, 43);
toc1on.src = "images/header_banner1_.jpg";

toc2off = new Image(189, 43);
toc2off.src = "images/header_banner2.jpg";
toc2on = new Image(189, 43);
toc2on.src = "images/header_banner2_.jpg";

toc3off = new Image(189, 43);
toc3off.src = "images/header_banner3.jpg";
toc3on = new Image(189, 43);
toc3on.src = "images/header_banner3_.jpg";

}
function img_act(imgName) {
if (version == "new") {
imgOn = eval(imgName + "on.src");
document [imgName].src = imgOn;
}
}
function img_inact(imgName) {
if (version == "new") {
imgOff = eval(imgName + "off.src");
document [imgName].src = imgOff;
}
}