function initGallery() {
  if (!document.getElementsByTagName) return false;
  if (!document.getElementById) return false;
  if (!document.getElementById("gallery1")) return false;

  var gallery = document.getElementById("gallery1");
  var links = gallery.getElementsByTagName("a");
  for (var i=0; i < links.length; i++) {
    links[i].onclick = function() {
      return showPic(this);
    }
  }
}

function showPic(whichpic) {
  if(!document.getElementById("pic")) return true;

  var source = whichpic.getAttribute("href");
  var pic = document.getElementById("pic");
  if (pic.nodeName != "IMG") return true;

  pic.setAttribute("src", source);
  if (!document.getElementById("caption")) return false;
  var text = whichpic.getAttribute("title") ? whichpic.getAttribute("title") : "";
  var caption = document.getElementById("caption");
  if (caption.firstChild.nodeType == 3) {
    caption.firstChild.nodeValue = text;
  }
  return false;
}