$('#topMenu').ready(function() {
    $('#topMenu li ul').css('display', 'none');
});

var timeout = 500;
var closetimer = 0;
var selectedMenuItem = 0;

function MainMenuOpen() {
    MainMenuCancelTimer();
    MenuItemClose();
    selectedMenuItem = $(this).find('ul').css('display', 'block');
}

function MenuItemClose() {
    if (selectedMenuItem) {
        selectedMenuItem.css('display', 'none')
    };
}

function MainMenuTimer() {
    closetimer = window.setTimeout(MenuItemClose, timeout);
}

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

$(document).ready(function() {
    $('#topMenu > li').bind('mouseover', MainMenuOpen)
    $('#topMenu > li').bind('mouseout', MainMenuTimer)
    document.onclick = MenuItemClose;
});