window.onload = function() {
  if (document.getElementById) {
    var obj = document.getElementById('popup');
    obj.innerHTML = obj.innerHTML.replace(/<dt>/gi, '<dt onmouseover="popup(this, true);" onmouseout="popup(this, false);">');
    obj.innerHTML = obj.innerHTML.replace(/<li>/gi, '<li onmouseover="popup(this, true);" onmouseout="popup(this, false);">');
  }
}
function popup(obj, visible) {
  var o = obj.getElementsByTagName('ul').item(0);
  if (o) {
    o.style.display = (visible) ? 'block' : 'none';
  }
}