recordset paging problem

How can I give a recordset paging the possibility to loop,by that I mean not to stop on the last record but continue with the first record and the first record has a back link to the last record. This script I use now for getting the next record:
<?php printf("%s?pageNum_photos=%d%s", $currentPage, min($totalPages_photos, $pageNum_photos + 1), $queryString_photos); ?>

Thanks for helping me learning more!!