function showPic(whichpic) {
  if (!document.getElementById('placeholder')) return true;
  var source = whichpic.getAttribute('href');
  var placeholder = document.getElementById('placeholder');
  placeholder.setAttribute('src',source);  
  if (whichpic.getAttribute('title')) {
    var text = whichpic.getAttribute('title');
  } else {
    var text = "";
  }
  var description = document.getElementById('desc');
  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);
	}
    links[i].onkeypress = links[i].onclick;
  }
}

function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}

addLoadEvent(prepareGallery);