function closemenu(item) {
  if (item.style.visibility == 'hidden') { item.style.visibility = 'visible'; item.style.display = 'inline'; }
  else { item.style.visibility = 'hidden'; item.style.display = 'none'; }
}

function openitem(id) {
  if (document.getElementById('categorylist_'+id).parentNode.id != 'categorygroup_-1') { closemenu(document.getElementById('categorylist_'+id).parentNode); }
}