function showPic (whichpic) {
  if (!document.getElementById) return true;
	var url = whichpic.href;
	var newpic = url.substring(url.indexOf(".com\/")+5,url.lastIndexOf("\/"));
  document.getElementById('displayedimage').src = '/images/home_' + newpic + '.jpg';
  document.getElementById('displayedimage').alt = '/images/home_' + newpic + '.jpg';
  return false;
}
function prepareGallery() {
  if (!document.getElementsByTagName) return false;
  if (!document.getElementById) return false;
  if (!document.getElementById("content")) return false;
  var gallery = document.getElementById("worknav");
  var links = gallery.getElementsByTagName("a");
  for ( var i=0; i < links.length; i++) {
    links[i].onmouseover = function() {
      return showPic(this);
    }
  }
}
window.onload=prepareGallery;