// avoid multiple mouseover/mouseout
  function isMouseLeaveOrEnter(e, handler) { 
    if (e.type != 'mouseout' && e.type != 'mouseover') return false; 
    var reltg = e.relatedTarget ? e.relatedTarget : e.type == 'mouseout' ? e.toElement : e.fromElement; 
    while (reltg && reltg != handler) reltg = reltg.parentNode; 
    return (reltg != handler); 
  }