$(document).ready
(  

    function()
    {
        var timeout    = 500;
        var closetimer = 100;
        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;
    }
);