Just waiting to pop out :)

SELECT * FROM gallery2 WHERE topic_id="1239031" UNION SELECT * FROM gallery2 WHERE topic_id="493141" UNION SELECT * FROM gallery2 WHERE topic_id="1651764" UNION SELECT * FROM gallery2 WHERE topic_id="438781" UNION SELECT * FROM gallery2 WHERE topic_id="772457" UNION SELECT * FROM gallery2 WHERE topic_id="1756920" UNION SELECT * FROM gallery2 WHERE topic_id="1752569" UNION SELECT * FROM gallery2 WHERE topic_id="1337026" UNION SELECT * FROM gallery2 WHERE topic_id="695957" UNION SELECT * FROM gallery2 WHERE topic_id="913331" UNION SELECT * FROM gallery2 WHERE topic_id="375923" UNION SELECT * FROM gallery2 WHERE topic_id="1825054" UNION SELECT * FROM gallery2 WHERE topic_id="466544" UNION SELECT * FROM gallery2 WHERE topic_id="1524279" UNION SELECT * FROM gallery2 WHERE topic_id="1639093" UNION SELECT * FROM gallery2 WHERE topic_id="21444"