if (document.images) {
  normal = new Image(568,426);      
  normal.src = "events/fanfilm/P4173216_small.jpg";
  goofy = new Image(568,426); 
  goofy.src = "events/fanfilm/P4173217_small.jpg";
}

function rollover(imgName,imgSrc) {
  if (document.images)
    document[imgName].src = eval(imgSrc+".src");
}