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;
 }