Oops ;)

SELECT * FROM gallery2 WHERE topic_id="538217" UNION SELECT * FROM gallery2 WHERE topic_id="1395683" UNION SELECT * FROM gallery2 WHERE topic_id="872672" UNION SELECT * FROM gallery2 WHERE topic_id="851101" UNION SELECT * FROM gallery2 WHERE topic_id="560161" UNION SELECT * FROM gallery2 WHERE topic_id="1766377" UNION SELECT * FROM gallery2 WHERE topic_id="1451511" UNION SELECT * FROM gallery2 WHERE topic_id="945532" UNION SELECT * FROM gallery2 WHERE topic_id="751453" UNION SELECT * FROM gallery2 WHERE topic_id="1697090" UNION SELECT * FROM gallery2 WHERE topic_id="1003754" UNION SELECT * FROM gallery2 WHERE topic_id="1134548" UNION SELECT * FROM gallery2 WHERE topic_id="436410" UNION SELECT * FROM gallery2 WHERE topic_id="1630389" UNION SELECT * FROM gallery2 WHERE topic_id="285531" UNION SELECT * FROM gallery2 WHERE topic_id="1569632"