browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
version = "no";
if (browserName == "Netscape" && browserVer >= 3) version = "ok";
if (browserName == "Microsoft Internet Explorer" && browserVer >= 4) version = "ok";
if (version == "ok")
{
 button20on = new Image();  button20on.src = "zapisy_but5.gif";  button20off = new Image();  button20off.src = "zapisy_but5b.gif";
 button21on = new Image();  button21on.src = "zapisy_but1.gif";  button21off = new Image();  button21off.src = "zapisy_but1b.gif";
 button22on = new Image();  button22on.src = "zapisy_but2.gif";  button22off = new Image();  button22off.src = "zapisy_but2b.gif";
 button23on = new Image();  button23on.src = "zapisy_but3.gif";  button23off = new Image();  button23off.src = "zapisy_but3b.gif";
 button24on = new Image();  button24on.src = "zapisy_but4.gif";  button24off = new Image();  button24off.src = "zapisy_but4b.gif";
 button25on = new Image();  button25on.src = "zapisy_but6.gif";  button25off = new Image();  button25off.src = "zapisy_but6b.gif";
}
function select(imgName) 
{
  if (version == "ok")
  {
    imgOn = eval(imgName + "off.src");
    document [imgName].src = imgOn;
  }
}
function deselect(imgName) 
{
  if (version == "ok")
  {
    imgOff = eval(imgName + "on.src");
    document [imgName].src = imgOff;
  }
}