$(document).ready(function(){
        $("#contenu").find('.add').hide();
        $("#contenu h2.open, #contenu h2.close").click(function() {
                var $this = $(this);
                if( $this.is('.open') ) {
                        $this.next().slideUp("fast");
                        $this.removeClass('open');
                        $this.addClass('close');
                }
                else {
                        $this.next().slideDown("slow");
                        $this.removeClass('close');
                        $this.addClass('open');
                }
                return false;
        });
});