Lightbox funktioniert nicht

if (!function_exists('mh_scripts')) {
    function mh_scripts() {
        wp_enqueue_style('mh-google-fonts', '//fonts.googleapis.com/css?family=Open+Sans:400,400italic,700,600', array(), null);
        wp_enqueue_style('mh-style', get_stylesheet_uri(), false, '1.8.3');
        wp_enqueue_script('scripts', get_template_directory_uri() . '/js/scripts.js', array('jquery'));
        if (!is_admin()) {
            if (is_singular() && comments_open() && (get_option('thread_comments') == 1))
                wp_enqueue_script('comment-reply');
        }
    }
}
add_action('wp_enqueue_scripts', 'mh_scripts');