var submenu_ids = [4,5,6];
var ignore_next_hide = false;

function showSubMenu (show_id) {
  if (show_id == -1) {
    if (ignore_next_hide) {
      ignore_next_hide = false;
      return;
    }
  } else {
    ignore_next_hide = true;
  }
  for (var i = 0; i < submenu_ids.length; i++) {
    submenu_id = submenu_ids[i];
    var submenu = document.getElementById ('submenu' + submenu_id);
    if (submenu_id == show_id) {
      submenu.style.display = (submenu.style.display != 'block') ? 'block' : 'none';
      submenu.style.left = (4 + 12 + (submenu_id - 1) * 116) + 'px';
      submenu.style.top = (0 + 120 + 1 + 28 + 2) + 'px';
    } else {
      submenu.style.display = 'none';
    }
  }
}