function img_act(imgName) {
    imgOn = eval(imgName + "On.src"); document [imgName].src = imgOn;
  }

  function img_inact(imgName) {
    imgOf = eval(imgName + "Of.src"); document [imgName].src = imgOf;
  }

  zarzadOn   = new Image(86,19);  zarzadOn.src   = "btn/zarzadon.jpg";      zarzadOf   = new Image(86,19);  zarzadOf.src   = "btn/zarzadof.jpg";
  historiaOn = new Image(86,19);  historiaOn.src = "btn/historiaon.jpg";    historiaOf = new Image(86,19);  historiaOf.src = "btn/historiaof.jpg";
  dzialalnOn = new Image(86,19);  dzialalnOn.src = "btn/dzialalnon.jpg";    dzialalnOf = new Image(86,19);  dzialalnOf.src = "btn/dzialalnof.jpg";
  sukcesyOn  = new Image(86,19);  sukcesyOn.src  = "btn/sukcesyon.jpg";     sukcesyOf  = new Image(86,19);  sukcesyOf.src  = "btn/sukcesyof.jpg";
//inpeOn     = new Image(86,19);  inpeOn.src     = "btn/inpeon.jpg";        inpeOf     = new Image(86,19);  inpeOf.src     = "btn/inpeof.jpg";
  guestbkOn  = new Image(86,19);  guestbkOn.src  = "btn/guestbkon.jpg";     guestbkOf  = new Image(86,19);  guestbkOf.src  = "btn/guestbkof.jpg";
  linkiOn    = new Image(86,19);  linkiOn.src    = "btn/linkion.jpg";       linkiOf    = new Image(86,19);  linkiOf.src    = "btn/linkiof.jpg";