var menuOpen;
    var m_timerID = null;

    function hideSubMenu()
    {
        if (menuOpen != null) {
            menuOpen.style.display = 'none';
        }
    }

    function subMenuEnter()
    {
        if (m_timerID != null) {
            window.clearTimeout(m_timerID);
            m_timerID = null;
        }
    }

    function subMenuLeave(timeOut)
    {
        m_timerID = window.setTimeout("hideSubMenu()", timeOut);
    }

    function showMenu(menu, display)
    {

        var submenu = null;

        if (menu != null) {
            submenu = document.getElementById("sub" + menu.id);
        }

        if (menuOpen != null) {
            menuOpen.style.display = 'none';
        }

        if (submenu != null) {
            submenu.style.left = menu.offsetLeft + 'px';
            submenu.style.top = (menu.offsetTop + menu.offsetHeight + 1) + 'px';
            submenu.style.display = display;
            menuOpen = submenu;
        }
    }