if (document.images) {
  image2 = new Image;
  image3 = new Image;
  image4 = new Image;
  image2.src = '../images\/t1.gif';
  image3.src = '../images\/t2.gif';
  image4.src = '../images\/t3.gif';
} else {
  image2 = '';
  image3 = '';
  image4 = '';
  document.rollimg1 = '';
}