how can I make open-close menu?

hi I want to make open-close menu with jquery. like ( http://www.mondialmotor.com.tr/ ). I can open menü but I cant close it. my codes are:

$("div#banner").not(":first").hide();
    $("ul.tab li").click(function(){
        var index=$(this).index();
        $("div#banner").hide();
        $("div#banner").eq(index).slideToggle(1000);
    });

thanks.