function roll(id, newSrc) {
    var theImage = findImage(document, id, 0);
    if (theImage) {
      if (typeof(keep) == 'undefined')
        theImage.src = newSrc;
      else {
        if (id != keep)
          theImage.src = newSrc;
      }
    }
}

function findImage(doc, name, j) {
    var theImage = false;
    if (doc.images) theImage = doc.images[name];
    if (theImage) return theImage;
    if (doc.layers) {
        for (j = 0; j < doc.layers.length; j++) {
            theImage = findImage(doc.layers[j].document, name, 0);
            if (theImage) return (theImage);
        }
    }
    return (false);
}