var imgIconOff = new Image();
	var imgIconOver = new Image();

	imgIconOff.src = "/hiaff/images/navigation_icon_off.gif";
	imgIconOver.src = "/hiaff/images/navigation_icon_over.gif";

	function changeNavIcon(imageName, title) {
		document.images[imageName].src = (document.images[imageName].src.indexOf("_off") > -1) ? imgIconOver.src : imgIconOff.src;
		window.status = title;
	}