var imgList = new Array (
   "images/nav-button/home-over.gif",
   "images/nav-button/karts-over.gif",
   "images/nav-button/skips-over.gif",
   "images/nav-button/commercial-over.gif",
   "images/nav-button/contact-over.gif"
   );

  var imgOver = new Array();

  var countImg
    if (document.images){

    for (countImg=0; countImg<imgList.length; countImg++){
		imgOver[countImg]=new Image(); imgOver[countImg].src=imgList[countImg];
		}
	}