if (document.images) {

	img1on = new Image();
	img1on.src = "images/home-page_on.gif";
	img1off = new Image();
	img1off.src = "images/home-page_off.gif";

	img2on = new Image();
	img2on.src = "images/meet-kate_on.gif";
	img2off = new Image();
	img2off.src = "images/meet-kate_off.gif";

	img3on = new Image();
	img3on.src = "images/cat-grooming_on.gif";
	img3off = new Image();
	img3off.src = "images/cat-grooming_off.gif";

	img4on = new Image();
	img4on.src = "images/links_on.gif";
	img4off = new Image();
	img4off.src = "images/links_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");
        }
}