// GENERATE A RANDOM BANNER IMAGE


  // no match, choose from one of the default sets
  var n = 1; // default image
  
  // pick a number between 1 and 10
  var chance = Math.round(Math.random()*9) + 1;

  // use each set 40/60% of the time

    // Aerial Images
    var r = 27; // # of images in set
    n = (Math.round(Math.random()*(r - 1)) + 1); // generate random number
    i = "http://www.undplao.org/images/banner/banner" + n + ".jpg";
    credit = "";


// write image CSS
document.write('<style type="text/css">.banner {background-image: url(' + i + ');}</style>');