function rotate_submenu(obj,id)
{
  if (obj.className == "main")
  {
    if (cur_menu>0)
    {
      var obj1=document.getElementById("menu_"+cur_menu);
      obj1.parentNode.className="";
      obj1.className="main";
      if (obj1.childNodes[1])
        obj1.childNodes[1].src="/img/m_vert_marker.gif";
      if (document.getElementById("submenu_"+cur_menu))
        document.getElementById("submenu_"+cur_menu).style.display="none";
    }
    obj.parentNode.className="sel";
    obj.className="main1";
    obj.childNodes[1].src="/img/m_vert_marker_1.gif";
    document.getElementById("submenu_"+id).style.display="block";
    cur_menu=id;
  }
  else
  {
    obj.parentNode.className="";
    obj.className="main";
    obj.childNodes[1].src="/img/m_vert_marker.gif";
    document.getElementById("submenu_"+id).style.display="none";
  }
}