var able = false;   


function DetekujBrowser()
{
    if ((navigator.userAgent.substring(0,9) == "Mozilla/3") || (navigator.userAgent.substring(0,9) == "Mozilla/4"))
    able = true;
  }
function DefinujPics()
  {
    if (able)
    {
      OautorceOn         = new Image;
      OautorceOn.src     = "images/tl_oautorce_on.gif";
      OautorceOff        = new Image;
      OautorceOff.src    = "images/tl_oautorce.gif";

      KontaktOn         = new Image;
      KontaktOn.src     = "images/tl_kontakt_on.gif";
      KontaktOff        = new Image;
      KontaktOff.src    = "images/tl_kontakt.gif";
      
      GalerieOn         = new Image;
      GalerieOn.src     = "images/tl_galerie_on.gif";
      GalerieOff        = new Image;
      GalerieOff.src    = "images/tl_galerie.gif";
      
      GobelinOn         = new Image;
      GobelinOn.src     = "images/tl_gobeliny_on.gif";
      GobelinOff        = new Image;
      GobelinOff.src    = "images/tl_gobeliny.gif";
      
      ObrazOn         = new Image;
      ObrazOn.src     = "images/tl_obrazy_on.gif";
      ObrazOff        = new Image;
      ObrazOff.src    = "images/tl_obrazy.gif";

      SochyOn         = new Image;
      SochyOn.src     = "images/tl_sochy_on.gif";
      SochyOff        = new Image;
      SochyOff.src    = "images/tl_sochy.gif";
      }
}
function PushOn(imgName)
  {
   if (able)
     {
      imgOn = eval(imgName + "On.src");
      document [imgName].src = imgOn;
           }
  }
function PushOff(imgName)
  {
   if (able)
     {
      imgOff = eval(imgName + "Off.src");
      document [imgName].src = imgOff;
     }
  }
DetekujBrowser();
DefinujPics();