if (document.images) {
		img1 = new Image();
        img1.src = "images/link0a.gif";
		img2 = new Image();
        img2.src = "images/link1a.gif";
		img3 = new Image();
        img3.src = "images/link2a.gif";
		img4 = new Image();
        img4.src = "images/link3a.gif";
		img5 = new Image();
        img5.src = "images/link4a.gif";
		img6 = new Image();
        img6.src = "images/link5a.jpg";
}

function linkOn(num)
{
document.images['link' + (num)].src = "images/link"+(num)+"a.gif"
}

function linkOff(num)
{
document.images['link' + (num)].src = "images/link"+(num)+".gif"
}