browser_name = navigator.appName;
browser_version = parseFloat(navigator.appVersion);
if (browser_name == "Netscape" && browser_version >= 3.0) {
  version = "ok";
}
else if (browser_name == "Microsoft Internet Explorer" && browser_version >= 3.0) {
  version = "ok";
} else {
  version = "bad";
}






function imgact(imgName) {
  if (version == "ok") {
    imgOn = eval(imgName + "on.src");
    document [imgName].src = imgOn;
  }
}

function imgnoact(imgName) {
  if (version == "ok") {
    imgOff = eval(imgName + "off.src");
    document [imgName].src = imgOff;
  }
}