if (document.images) {
  banner_left = new Array();
  banner_left[0] = new Image();
  banner_left[0].src = "../images/banner_left0.jpg";
  banner_left[1] = new Image();
  banner_left[1].src = "../images/banner_left1.jpg";
  banner_left[2] = new Image();
  banner_left[2].src = "../images/banner_left2.jpg";

  banner_right = new Array();
  banner_right[0] = new Image();
  banner_right[0].src = "../images/banner_right0a.jpg";
  banner_right[1] = new Image();
  banner_right[1].src = "../images/banner_right1a.jpg";
  banner_right[2] = new Image();
  banner_right[2].src = "../images/banner_right2a.jpg";
}

speed = 5000;
slideNumber = 0;

function showSlide() {
if (document.images) {
   if (document.all) {
      document.all.left_screen.src = banner_left[slideNumber].src;
      document.all.right_screen.src = banner_right[slideNumber].src;
   }
   else {
      document.getElementById('left_screen').src = banner_left[slideNumber].src;
      document.getElementById('right_screen').src = banner_right[slideNumber].src;
   }
   if (slideNumber < (banner_left.length-1)) {
      slideNumber++;
   }
   else {   
      slideNumber = 0;
   }
   setTimeout('showSlide()', speed);
}
}