showContainer = "historyList"; // container definition list class name
    showHover = "historyListHover"; // dt hover style class name
    showOn = "historyListOn"; // dt on style class name

  jQuery.preloadImages = function() {
    for(var i = 0; i<arguments.length; i++) {
      jQuery("<img>").attr("src", arguments[i]);
    }
  }

  $(document).ready(function(){
      $("div#banner").hide();
      var randomImages = ['01','02','03','04','05','06']; // generic entries, one for each history banner image that exists
      var rndNum = randomImages.splice(Math.random() * randomImages.length|0,1); // chooses random number from total number of entries in randomImages variable
      $("div#banner").children("img").attr("src", "/en/img/about/history/main/img_banner_history_" + rndNum + ".jpg" ); // writes image source based on random selection
      $("div#banner").show();
  });