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;
}