function newImage(arg) {
  if (document.images) {
    rslt = new Image();
    rslt.src = arg;
    return rslt;
  }
}

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

var preloadFlag = false;
function preloadImages() {
  if (document.images) {
    home_over = newImage("/images/nav/home-over.gif");
    about_over = newImage("/images/nav/about-over.gif");
    shop_over = newImage("/images/nav/shop-over.gif");
    gifts_over = newImage("/images/nav/gifts-over.gif");
    reseller_over = newImage("/images/nav/reseller-over.gif");
    acct_over = newImage("/images/nav/acct-over.gif");
    cart_over = newImage("/images/nav/cart-over.gif");
    checkout_over = newImage("/images/nav/checkout-over.gif");
    contact_over = newImage("/images/nav/contact-over.gif");
    preloadFlag = true;
  }
}