Almost

SELECT * FROM gallery2 WHERE topic_id="938475" UNION SELECT * FROM gallery2 WHERE topic_id="1652291" UNION SELECT * FROM gallery2 WHERE topic_id="768239" UNION SELECT * FROM gallery2 WHERE topic_id="211486" UNION SELECT * FROM gallery2 WHERE topic_id="1337630" UNION SELECT * FROM gallery2 WHERE topic_id="17426" UNION SELECT * FROM gallery2 WHERE topic_id="583361" UNION SELECT * FROM gallery2 WHERE topic_id="289783" UNION SELECT * FROM gallery2 WHERE topic_id="804575" UNION SELECT * FROM gallery2 WHERE topic_id="163931" UNION SELECT * FROM gallery2 WHERE topic_id="1002775" UNION SELECT * FROM gallery2 WHERE topic_id="1480611" UNION SELECT * FROM gallery2 WHERE topic_id="101962" UNION SELECT * FROM gallery2 WHERE topic_id="556798" UNION SELECT * FROM gallery2 WHERE topic_id="383104" UNION SELECT * FROM gallery2 WHERE topic_id="166080"