var rollOverArr = new Array();

function setrollover(OverImgSrc,pageImageName) {
    if (! document.images) return;
    if (pageImageName == null)
        pageImageName = document.images[document.images.length-1].name;
    rollOverArr[pageImageName] =new Object;
    rollOverArr[pageImageName].overImg = new Image;
    rollOverArr[pageImageName].overImg.src = OverImgSrc;
}

function rollover(pageImageName) {
    if (! document.images) return;
    if (! rollOverArr[pageImageName]) return;
    if (! rollOverArr[pageImageName].outImg) {
        rollOverArr[pageImageName].outImg = new Image;
        rollOverArr[pageImageName].outImg.src = document.images[pageImageName].src;
    }
    document.images[pageImageName].src = rollOverArr[pageImageName].overImg.src;
}

function rollout(pageImageName) {
	if (! document.images) return;
	if (! rollOverArr[pageImageName]) return;
	document.images[pageImageName].src = rollOverArr[pageImageName].outImg.src;
}