$('.year-item').on('click', function(){
        $(this).next().toggle();
        cerrarItems($(this));
    });

    $('.month-item').on('click', function(){
        $(this).next().toggle();
        cerrarItems($(this));      
    });

    $('.category-item').on('click', function(){
        $(this).next().toggle();
        cerrarItems($(this));
    });

    function cerrarItems(element){
        var clase = element.attr('class');   
        if(clase == 'year-item' || clase == "category-item"){
            var monthPosts = $('.list-months').not(element.next());
            monthPosts.each(function(){
                $(this).hide();
            });
        }
        var listPosts = $('.list-posts').not(element.next());
        listPosts.each(function(){
            $(this).hide();
        });
    };