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")
{

  but1on = new Image();
  but1on.src = "images/ico/polecZnajom.gif";
  but1off = new Image();
  but1off.src = "images/ico/polecZnajom_over.gif";

  but3on = new Image();
  but3on.src = "images/ico/drukuj.gif";
  but3off = new Image();
  but3off.src = "images/ico/drukuj_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;
  }
}