$(function() {
 
    var conteiners = $('#menu li > div').hide();
 
    $('a.js').click(function() {
        var conteiner = $(this).next();
        if(conteiner.is(':hidden')) {
            conteiners.filter(':visible').slideUp();
            conteiner.slideDown();
        }
        else conteiner.slideUp();
        return false;
    });
 
});