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 if (browser_name == "Opera" && browser_version >= 6.0) {
  version = "ok";
}
else {
  version = "bad";
}


if (version == "ok") {

 polskion = new Image();
 polskion.src="images/index/pl1.jpg";
 polskioff = new Image();
 polskioff.src="images/index/pl.jpg";

 englishon = new Image();
 englishon.src="images/index/en1.jpg";
 englishoff = new Image();
 englishoff.src="images/index/en.jpg";

 deutschon = new Image();
 deutschon.src="images/index/de1.jpg";
 deutschoff = new Image();
 deutschoff.src="images/index/de.jpg";
 
 angon = new Image();
 angon.src="images/page/en1.jpg";
 angoff = new Image();
 angoff.src="images/page/en.jpg";
 
 niemon = new Image();
 niemon.src="images/page/de1.jpg";
 niemoff = new Image();
 niemoff.src="images/page/de.jpg";
 
 polon = new Image();
 polon.src="images/page/pl1.jpg";
 poloff = new Image();
 poloff.src="images/page/pl.jpg";
 
 pol2on = new Image();
 pol2on.src="images/page/pl21.jpg";
 pol2off = new Image();
 pol2off.src="images/page/pl2.jpg";

 

 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;
   }
 }

}