function toggleMenu(id) {

    var e = document.getElementById(id);

    if (e == null) return;

    var tags = document.getElementsByTagName("div");

    for (var i = 0; i < tags.length; i++) {

      if (tags[i].getAttribute("submenu") == "yes") {

        if (tags[i] == e) continue;

        if (tags[i].getAttribute("locked") == "yes") continue;

        tags[i].style.display = "none";

      }

    }

    if (e.getAttribute("locked") != "yes") {

      e.style.display = (e.style.display != "block")?"block":"none";

    }

  }