if (document.images) {
  image1on = new Image();
  image1on.src = "/images/home_over.gif";

  image2on = new Image();
  image2on.src = "/images/newsletters_over.gif";

  image3on = new Image();
  image3on.src = "/images/online_over.gif";

  image4on = new Image();
  image4on.src = "/images/about_over.gif";
  
  image1off = new Image();
  image1off.src = "/images/home.gif";

  image2off = new Image();
  image2off.src = "/images/newsletters.gif";

  image3off = new Image();
  image3off.src = "/images/online.gif";

  image4off = new Image();
  image4off.src = "/images/about.gif";
  

  image1click = new Image();
  image1click.src = "/images/home_down.gif";

  image2click = new Image();
  image2click.src = "/images/newsletters_down.gif";

  image3click = new Image();
  image3click.src = "/images/online_down.gif";

  image4click = new Image();
  image4click.src = "/images/about_down.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");
    }
  }
}