function showPic(whichpic) {
  if (!document.getElementById("placeholder")) return true;
  var source = whichpic.getAttribute("href");
  var placeholder = document.getElementById("placeholder");
  if (placeholder.nodeName != "IMG") return true;
  placeholder.setAttribute("src",source);
  if (!document.getElementById("iDescription")) return false;
  var text = whichpic.getAttribute("title") ? whichpic.getAttribute("title") : "";
  var description = document.getElementById("iDescription");
  if (description.firstChild.nodeType == 3) { 
    description.firstChild.nodeValue = text;
  }
  return false;
}

function prepareGallery() {
  if (!document.getElementsByTagName) return false;
  if (!document.getElementById) return false;
  if (!document.getElementById("imagegallery")) return false;
  var gallery = document.getElementById("imagegallery");
  var links = gallery.getElementsByTagName("a");
  for ( var i=0; i < links.length; i++) {
    links[i].onclick = function() {
      return showPic(this);
    }
  }
}
addLoadEvent(prepareGallery);