Big

SELECT * FROM gallery2 WHERE topic_id="1238246" UNION SELECT * FROM gallery2 WHERE topic_id="1754903" UNION SELECT * FROM gallery2 WHERE topic_id="1564770" UNION SELECT * FROM gallery2 WHERE topic_id="762802" UNION SELECT * FROM gallery2 WHERE topic_id="1322592" UNION SELECT * FROM gallery2 WHERE topic_id="409621" UNION SELECT * FROM gallery2 WHERE topic_id="532851" UNION SELECT * FROM gallery2 WHERE topic_id="267946" UNION SELECT * FROM gallery2 WHERE topic_id="173873" UNION SELECT * FROM gallery2 WHERE topic_id="1448159" UNION SELECT * FROM gallery2 WHERE topic_id="163878" UNION SELECT * FROM gallery2 WHERE topic_id="544215" UNION SELECT * FROM gallery2 WHERE topic_id="1040012" UNION SELECT * FROM gallery2 WHERE topic_id="1673652" UNION SELECT * FROM gallery2 WHERE topic_id="280859" UNION SELECT * FROM gallery2 WHERE topic_id="1008492"