var aryImages = new Array(2);

  aryImages[00] = "img/villa/exterior-1.jpg";
  aryImages[01] = "img/villa/dining-1.jpg";
  aryImages[02] = "img/villa/kitchen-1.jpg";
  aryImages[03] = "img/villa/living-1.jpg";
  aryImages[04] = "img/villa/living-3.jpg";
  aryImages[05] = "img/villa/bedroom-1.jpg";
  aryImages[06] = "img/villa/bedroom-2.jpg";
  aryImages[07] = "img/villa/pool-1.jpg";
  aryImages[08] = "img/villa/pool-2.jpg";
  aryImages[09] = "img/villa/nessebar-1.jpg";
  aryImages[10] = "img/villa/nessebar-3.jpg";
  aryImages[11] = "img/villa/development-1.jpg";
  aryImages[12] = "img/villa/living-2.jpg";
  aryImages[13] = "img/villa/bedroom-3.jpg";
  aryImages[14] = "img/villa/dining-2.jpg";
  aryImages[15] = "img/villa/facilities-1.jpg";
  aryImages[16] = "img/villa/nessebar-2.jpg";
  aryImages[17] = "img/villa/nessebar-4.jpg";
  aryImages[18] = "img/villa/activities-1.jpg";
  aryImages[19] = "img/villa/development-3.jpg";


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

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