if (document.images) {
  image18 = new Image;
  image19 = new Image;
  image20 = new Image;
  image21 = new Image;
  image18.src = '../images\/l19.jpg';
  image19.src = '../images\/l20.jpg';
  image20.src = '../images\/l21.jpg';
  image21.src = '../images\/l22.jpg';
} else {
  image18 = '';
  image19 = '';
  image20 = '';
  image21 = '';
  document.rollimg2 = '';
}