function showhide(element)
  {
    e = GetObj(element);

    if (e.style.display != 'none')
    {
      e.style.display = 'none';
    }
    else
    {
      e.style.display = 'block';
    }
  }

  function show(element)
  {
    e = GetObj(element);
    e.style.display = 'block';
  }
  function hide(element)
  {
    e = GetObj(element);
    e.style.display = 'none';
  }

  function refresh_node_icon(nodeelement, parentelement, opened_image, closed_image)
  {
    p = GetObj(parentelement);
    n = GetObj(nodeelement);

    if (p.style.display!='none')
    {
      n.style.backgroundImage='url('+closed_image+')';
    }
    else
    {
      n.style.backgroundImage='url('+opened_image+')';
    }
  }