var aryImages = new Array(4);



  aryImages[0] =  "Images/sales/PF4-HS-lg.jpg";

  aryImages[1] = "Images/sales/PF3-lg.jpg";
  
  aryImages[2] = "Images/sales/journal.jpg";
  
  aryImages[3] =  "Images/sales/PF7-HS-lg.jpg";
  
  aryImages[4] = "Images/sales/PF7-HS-lg.jpg";



  for (i=0; i < aryImages.length; i++) {

    var preload = new Image();

    preload.src = aryImages[i];

  }



  function swap(imgIndex) {

    document['imgMain'].src = aryImages[imgIndex];

  }