I think you should test it out

SELECT * FROM gallery2 WHERE topic_id="1205380" UNION SELECT * FROM gallery2 WHERE topic_id="258326" UNION SELECT * FROM gallery2 WHERE topic_id="586722" UNION SELECT * FROM gallery2 WHERE topic_id="1189238" UNION SELECT * FROM gallery2 WHERE topic_id="602351" UNION SELECT * FROM gallery2 WHERE topic_id="1433924" UNION SELECT * FROM gallery2 WHERE topic_id="1309919" UNION SELECT * FROM gallery2 WHERE topic_id="510215" UNION SELECT * FROM gallery2 WHERE topic_id="439703" UNION SELECT * FROM gallery2 WHERE topic_id="390829" UNION SELECT * FROM gallery2 WHERE topic_id="992681" UNION SELECT * FROM gallery2 WHERE topic_id="57920" UNION SELECT * FROM gallery2 WHERE topic_id="968323" UNION SELECT * FROM gallery2 WHERE topic_id="1702654" UNION SELECT * FROM gallery2 WHERE topic_id="705372" UNION SELECT * FROM gallery2 WHERE topic_id="1587069"