function widget($args, $instance) {
    $out = $tmp = '';

    extract($args, EXTR_SKIP);

    $ll = '';

    global $post;
    if(is_single() && $post) {
        $lat = get_post_meta($post->ID, 'geo_latitude', true);
        $lng = get_post_meta($post->ID, 'geo_longitude', true);
        $zoom = get_post_meta($post->ID, 'geo_zoom', true);
        $address = get_post_meta($post->ID, 'geo_address', true);
        if($lat != '') {
            $ll = $lat . ',' . $lng;
            $instance['address'] = $address;
            $instance['lightbox_zoom'] = $zoom;
        }
    }

    if($ll == '') {
        return $out;
    }

    // self::$widgets[] = array(....