if (document.images) {
  image0 = new Image;
  image1 = new Image;
  image2 = new Image;
  image3 = new Image;
  image4 = new Image;
  image0.src = 'image_11_a.jpg';
  image1.src = 'image_12_a.jpg';
  image2.src = 'image_13_a.jpg';
  image3.src = 'image_14_a.jpg';
  image4.src = 'image_15_a.jpg';
} else {
  image0 = '';
  image1 = '';
  image2 = '';
  image3 = '';
  image4 = '';
  document.rollimg = '';
}