function showInfo(layerID)
  {
  var showLayer = document.getElementById(layerID);
  showLayer.style.display="block";
  }

  function hideInfo(layerID)
  {
  var hideLayer = document.getElementById(layerID);
  hideLayer.style.display="none";
  }


  function ExpandDisp(ID, imgID)
  {
    //none: not visible ; block: visible
       document.getElementById(imgID).src =
      ((document.getElementById(ID).style.display == "none") ? "Images/iconMinus.jpg" : "Images/iconPlus.jpg");
      document.getElementById(ID).style.display =
       ((document.getElementById(ID).style.display == "none") ? "block" : "none");
   return;
 }