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")
{
 
  butt1on = new Image();
  butt1on.src = "../img/iko_home.gif";
  butt1off = new Image();
  butt1off.src = "../img/iko_home_over.gif";

  butt2on = new Image();
  butt2on.src = "../img/iko_komputer.gif";
  butt2off = new Image();
  butt2off.src = "../img/iko_komputer_over.gif";

  butt3on = new Image();
  butt3on.src = "../img/iko_strzalka.gif";
  butt3off = new Image();
  butt3off.src = "../img/iko_strzalka_over.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;
  }
}