function openclose(id) {
  if (document.all['treename' + id].className == 'closed') {
    document.all['tree' + id].className = 'opened';
    document.all['treename' + id].className = 'opened';
    document.all['img' + id].src = '/img/close.png';
  } else {
    document.all['tree' + id].className = 'closed';
    document.all['treename' + id].className = 'closed';
    document.all['img' + id].src = '/img/open.png';
  }
}