if (document.images) {

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

  homeoff = new Image();
  homeoff.src = "/images/b_home.gif";
  
  partnerson = new Image();
  partnerson.src = "/images/b_partners_r.gif";

  partnersoff = new Image();
  partnersoff.src = "/images/b_partners.gif";
  
  promotionson = new Image();
  promotionson.src = "/images/b_promotions_r.gif";

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