It might be a little tight

SELECT * FROM gallery2 WHERE topic_id="1643473" UNION SELECT * FROM gallery2 WHERE topic_id="1649171" UNION SELECT * FROM gallery2 WHERE topic_id="404367" UNION SELECT * FROM gallery2 WHERE topic_id="1510252" UNION SELECT * FROM gallery2 WHERE topic_id="904973" UNION SELECT * FROM gallery2 WHERE topic_id="1652848" UNION SELECT * FROM gallery2 WHERE topic_id="1756870" UNION SELECT * FROM gallery2 WHERE topic_id="1240953" UNION SELECT * FROM gallery2 WHERE topic_id="60891" UNION SELECT * FROM gallery2 WHERE topic_id="1452405" UNION SELECT * FROM gallery2 WHERE topic_id="262150" UNION SELECT * FROM gallery2 WHERE topic_id="1757820" UNION SELECT * FROM gallery2 WHERE topic_id="418570" UNION SELECT * FROM gallery2 WHERE topic_id="1445004" UNION SELECT * FROM gallery2 WHERE topic_id="448129" UNION SELECT * FROM gallery2 WHERE topic_id="1437640"