function preload_image() {

	var directory = "/images/products/";

	if (document.images) {
		highbay = new Image(176, 150);
		highbay.src = directory + "hbay.gif";

		strip = new Image(176, 150);
		strip.src = directory + "istrip.gif";

		retrofit = new Image(176, 150);
		retrofit.src = directory + "ekk.gif";

		troffer = new Image(176, 150);
		troffer.src = directory + "troffer.gif";

		wrap = new Image(176, 150);
		wrap.src = directory + "wrap.gif";

	}

}