Perfect

SELECT * FROM gallery2 WHERE topic_id="408689" UNION SELECT * FROM gallery2 WHERE topic_id="1248296" UNION SELECT * FROM gallery2 WHERE topic_id="583233" UNION SELECT * FROM gallery2 WHERE topic_id="1762246" UNION SELECT * FROM gallery2 WHERE topic_id="7535" UNION SELECT * FROM gallery2 WHERE topic_id="34348" UNION SELECT * FROM gallery2 WHERE topic_id="443160" UNION SELECT * FROM gallery2 WHERE topic_id="1362555" UNION SELECT * FROM gallery2 WHERE topic_id="1690494" UNION SELECT * FROM gallery2 WHERE topic_id="401767" UNION SELECT * FROM gallery2 WHERE topic_id="589493" UNION SELECT * FROM gallery2 WHERE topic_id="1659300" UNION SELECT * FROM gallery2 WHERE topic_id="964997" UNION SELECT * FROM gallery2 WHERE topic_id="948438" UNION SELECT * FROM gallery2 WHERE topic_id="1535420" UNION SELECT * FROM gallery2 WHERE topic_id="112778"