var closetimer = 0;
var menuitem = 0;

function menu_open(){
    menu_canceltimer();
    menu_close();
    menuitem = $(this).find('ul').css('visibility', 'visible');
}

function menu_close(){
    if(menuitem)
        menuitem.css('visibility', 'hidden');
}

function menu_timer(){
    closetimer = window.setTimeout(menu_close, 50);
}

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

$(document).ready(
    function(){
    $('#menu > li').bind('mouseover', menu_open)
    $('#menu > li').bind('mouseout',  menu_timer)
    }
);

document.onclick = menu_close