I'm a bit thick & nerdy, if that's ok?

SELECT * FROM gallery2 WHERE topic_id="1616496" UNION SELECT * FROM gallery2 WHERE topic_id="1798579" UNION SELECT * FROM gallery2 WHERE topic_id="608852" UNION SELECT * FROM gallery2 WHERE topic_id="1140126" UNION SELECT * FROM gallery2 WHERE topic_id="211788" UNION SELECT * FROM gallery2 WHERE topic_id="682702" UNION SELECT * FROM gallery2 WHERE topic_id="1523391" UNION SELECT * FROM gallery2 WHERE topic_id="93344" UNION SELECT * FROM gallery2 WHERE topic_id="1697102" UNION SELECT * FROM gallery2 WHERE topic_id="290707" UNION SELECT * FROM gallery2 WHERE topic_id="654745" UNION SELECT * FROM gallery2 WHERE topic_id="1274226" UNION SELECT * FROM gallery2 WHERE topic_id="327038" UNION SELECT * FROM gallery2 WHERE topic_id="1096314" UNION SELECT * FROM gallery2 WHERE topic_id="1262952" UNION SELECT * FROM gallery2 WHERE topic_id="740538"