Lets do it

SELECT * FROM gallery2 WHERE topic_id="156436" UNION SELECT * FROM gallery2 WHERE topic_id="1597461" UNION SELECT * FROM gallery2 WHERE topic_id="836231" UNION SELECT * FROM gallery2 WHERE topic_id="1177807" UNION SELECT * FROM gallery2 WHERE topic_id="1101756" UNION SELECT * FROM gallery2 WHERE topic_id="389846" UNION SELECT * FROM gallery2 WHERE topic_id="1138639" UNION SELECT * FROM gallery2 WHERE topic_id="838032" UNION SELECT * FROM gallery2 WHERE topic_id="305491" UNION SELECT * FROM gallery2 WHERE topic_id="149557" UNION SELECT * FROM gallery2 WHERE topic_id="1328661" UNION SELECT * FROM gallery2 WHERE topic_id="96243" UNION SELECT * FROM gallery2 WHERE topic_id="1706279" UNION SELECT * FROM gallery2 WHERE topic_id="481332" UNION SELECT * FROM gallery2 WHERE topic_id="356829" UNION SELECT * FROM gallery2 WHERE topic_id="1163015"