var timeout    = 500;
    var closetimer = 0;
    var ddmenuitem = 0;

    function MenuDeroulant_open() {
        MenuDeroulant_canceltimer();
        MenuDeroulant_close();
        ddmenuitem = $(this).find('ul').css('visibility', 'visible');
    }

    function MenuDeroulant_close() {
        if(ddmenuitem)
            ddmenuitem.css('visibility', 'hidden');
    }

    function MenuDeroulant_timer() {
        closetimer = window.setTimeout(MenuDeroulant_close, timeout);
    }

    function MenuDeroulant_canceltimer() {
        if(closetimer)
            window.clearTimeout(closetimer);
        closetimer = null;
    }

    $(document).ready(function() {
        $('#MenuDeroulant > li').bind('mouseover', MenuDeroulant_open);
        $('#MenuDeroulant > li').bind('mouseout',  MenuDeroulant_timer);
        document.onclick = MenuDeroulant_close;
    });