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) {
    menu_about_hi = newImage("images/menu_about_hi.gif");
    menu_galleries_hi = newImage("images/menu_galleries_hi.gif");
    menu_contests_hi = newImage("images/menu_contests_hi.gif");
    menu_info_hi = newImage("images/menu_info_hi.gif");
    menu_contact_hi = newImage("images/menu_contact_hi.gif");
    scroll_left_hi = newImage("images/scroll_left_hi.gif");
    scroll_right_hi = newImage("images/scroll_right_hi.gif");			    
    preloadFlag = true;
  }
}