<a rel="nofollow" href="" class="fancybox" title="" rel="gallery">

<?php get_the_ID(),
        'post_type' => 'attachment',
        'post_mime_type' => 'image'
    ));

    foreach ( $attachments as $attachment_id => $attachment ) {
        echo '<a rel="nofollow" href="';
        echo '' . wp_get_attachment_url( $attachment_id ) . '" title="" rel="gallery">';
        echo '';
    }
?>