if (document.images) {
  homep1 = new Image();
  homep1.src = "images/homep1.gif";

  homep2 = new Image();
  homep2.src = "images/homep2.gif";

  chisono1 = new Image();
  chisono1.src = "images/chisono1.gif";

  chisono2 = new Image();
  chisono2.src = "images/chisono2.gif";

  progr1 = new Image();
  progr1.src = "images/progr1.gif";

  progr2 = new Image();
  progr2.src = "images/progr2.gif";

  muni1 = new Image();
  muni1.src = "images/muni1.gif";

  muni2 = new Image();
  muni2.src = "images/muni2.gif";

  cont1 = new Image();
  cont1.src = "images/cont1.gif";

  cont2 = new Image();
  cont2.src = "images/cont2.gif";

  link1 = new Image();
  link1.src = "images/link1.gif";

  link2 = new Image();
  link2.src = "images/link2.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");
    }
  }
}