var max      = 10;

  var nrImages = 3;

  function makeImages() {

    this[0]     = "Intro01.JPG";

    this[1]     = "Intro02.JPG";

    this[2]     = "Intro03.JPG";

    this.length = nrImages;

  }

  function makeLinks() {

    this[0]     = "store";

    this[1]     = "store";

    this[2]     = "store";

    this.length = nrImages;



  }

  var vetImages = new makeImages();

  var vetLinks  = new makeLinks();

  var x = Math.round(Math.random()*max);

  var y    = max / nrImages;

  for(var cont = 1;cont*y <= max;cont++) {

    if (x <= (cont*y)) {

      document.write("<a href="+vetLinks[cont-1]+" target=_blank><img  src="+vetImages[cont-1]+" border=0></a>");

      break;

    }

  }