function swapImages(img, fileSm, fileLg) {
  if (img.src.indexOf('thumb.php?width=100') > 0) {
    img.src = fileLg;
    goodzoom.src = '/im/zoom_out.gif';
  }
  else
  {
    img.src = fileSm;
    goodzoom.src = '/im/zoom.gif';
  };
  return false;
};