if (document.images) {
  banner_left = new Array();
  banner_left[0] = new Image();
  banner_left[0].src = "../images/promos/promos_banner_left1.jpg";
  banner_left[1] = new Image();
  banner_left[1].src = "../images/promos/promos_banner_left2.jpg";

  banner_right = new Array()
  banner_right[0] = new Image()
  banner_right[0].src = "../images/promos/promos_banner_right1a.jpg"
  banner_right[1] = new Image()
  banner_right[1].src = "../images/promos/promos_banner_right2a.jpg"
}

speed = 3000
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_right.length-1) {
      slideNumber++
   }
   else {   
      slideNumber = 0
   }
   setTimeout('showSlide()', speed)
}
}