var aryImages = new Array(2);

  aryImages[00] = "/images/W005.jpg";
  aryImages[01] = "/images/w1.jpg";
  aryImages[02] = "images/W2.jpg";
  aryImages[03] = "images/kitchen_1.jpg";
  aryImages[04] = "images//west-wing.jpg";


  for (i=0; i < aryImages.length; i++) {
    var preload = new Image();
    preload.src = aryImages[i];
  }

  function swap(imgIndex) {
    document['imgMain'].src = aryImages[imgIndex];
  }