$(function() {
    $('#slideshow').before('<div id="nav">').cycle({
        fx:     'fade',
        speed:   600,
        timeout: 4000, // 0 empechera l'animation de demarrer automatiquement
        pager:  '#slidenav ',
        before: function() { 
            $('#slidecaption').html(this.alt);
        }
    });
});