var orgPic;

function onloadglobal()
{
  orgPic = document.ProductImage.src;
  PreloadImages();
}

function handleout(oObj)
{
  document.ProductImage.src=orgPic;
}
function PreloadImages()
{
  var aProductImages = document.getElementsByClassName('optionalpic');
  var aPreloadImages = [];
  
  for(var i=0;i<aProductImages.length;i++)
  {
    aPreloadImages[i] = new Image(94,72);
    aPreloadImages[i].src = aProductImages[i].src;
  }
}