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) {
    dwff_nav_09_over = newImage("images/nav/dwff-nav_09-over.gif");
    dwff_nav_14_over = newImage("images/nav/dwff-nav_14-over.gif");
    dwff_nav_19_over = newImage("images/nav/dwff-nav_19-over.gif");
    dwff_nav_24_over = newImage("images/nav/dwff-nav_24-over.gif");
    dwff_nav_29_over = newImage("images/nav/dwff-nav_29-over.gif");
    dwff_nav_34_over = newImage("images/nav/dwff-nav_34-over.gif");
    dwff_nav_39_over = newImage("images/nav/dwff-nav_39-over.gif");
    preloadFlag = true;
  }
}