if (document.images) {
  image1on = new Image();  image1on.src = "img/o_firmie_on.gif";
  image2on = new Image();  image2on.src = "img/posciel_on.gif";
  image3on = new Image();  image3on.src = "img/koce_narzuty_on.gif";
  image4on = new Image();  image4on.src = "img/reczniki_on.gif";
  image5on = new Image();  image5on.src = "img/bielizna_nocna_on.gif";
  image6on = new Image();  image6on.src = "img/przescieradla_on.gif";
  image7on = new Image();  image7on.src = "img/kontakt_on.gif";

  image1off = new Image();  image1off.src = "img/o_firmie.gif";
  image2off = new Image();  image2off.src = "img/posciel.gif";
  image3off = new Image();  image3off.src = "img/koce_narzuty.gif";
  image4off = new Image();  image4off.src = "img/reczniki.gif";
  image5off = new Image();  image5off.src = "img/bielizna_nocna.gif";
  image6off = new Image();  image6off.src = "img/przescieradla.gif";
  image7off = new Image();  image7off.src = "img/kontakt.gif";
}

function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}