if (document.images) {

	img1on = new Image();
	img1on.src = "images/about.on.gif";
	img1off = new Image();
	img1off.src = "images/about.off.gif";

	img2on = new Image();
	img2on.src = "images/affiliates.on.gif";
	img2off = new Image();
	img2off.src = "images/affiliates.off.gif";

	img3on = new Image();
	img3on.src = "images/pasttrips.on.gif";
	img3off = new Image();
	img3off.src = "images/pasttrips.off.gif";

	img4on = new Image();
	img4on.src = "images/contact.on.gif";
	img4off = new Image();
	img4off.src = "images/contact.off.gif";

	img5on = new Image();
	img5on.src = "images/links.on.gif";
	img5off = new Image();
	img5off.src = "images/links.off.gif";

	img6on = new Image();
	img6on.src = "images/home.on.gif";
	img6off = new Image();
	img6off.src = "images/home.off.gif";

        }

function imgOn(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "on.src");
        }
}

function imgOff(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "off.src");
        }
}