function rollover(link,id,image) 
{
  if(document.images)
  {
    im              = document.images[id];
    im.oldimg       = new Image();
    im.newimg       = new Image();
    im.oldimg.src   = document.images[id].src;
    im.newimg.src   = image;
    im.src          = im.newimg.src;
    link.onmouseout = new Function("var im=document.images."+id+"; im.src=im.oldimg.src;");
    link.onmouseover= new Function("var im=document.images."+id+"; im.src=im.newimg.src;");
  }
}