function switch_submenu(id)
{
  if (document.getElementById("list_"+id).style.display == "none") var tmp = true;

  document.getElementById("list_1").style.display = "none";
  document.getElementById("list_2").style.display = "none";
  document.getElementById("list_3").style.display = "none";
  document.getElementById("list_4").style.display = "none";

  if (tmp) document.getElementById("list_"+id).style.display = "block";
  setCookie('open_list_id', id);
}

function show_selected_list(list_id)
{
  if (!list_id) list_id = getCookie('open_list_id');
  document.getElementById("list_"+list_id).style.display = "block";
}