var showItemMenu = null;
var offMenu = true;
var showItemMenuInterval = null;

function submenuOn(o) {
    if (showItemMenu != null)
        showItemMenu.style.display = "none";

    showItemMenu = o.nextSibling;
    showItemMenu.style.display = "block";
    offMenu = false;

    clearInterval(showItemMenuInterval);
    showItemMenuInterval = window.setInterval(submenuOff, 500);
    return false;
}

function subitemmenuOn() {
    offMenu = false;
}

function subitemmenuOff() {
    offMenu = true;
}

function submenuOff() {
    if (offMenu) {
        showItemMenu.style.display = "none";

        if (showItemMenuInterval != null)
            clearInterval(showItemMenuInterval);
    }
}