Thanks for sorting by new ;)

SELECT * FROM gallery2 WHERE topic_id="546804" UNION SELECT * FROM gallery2 WHERE topic_id="1581123" UNION SELECT * FROM gallery2 WHERE topic_id="156772" UNION SELECT * FROM gallery2 WHERE topic_id="1577329" UNION SELECT * FROM gallery2 WHERE topic_id="1200163" UNION SELECT * FROM gallery2 WHERE topic_id="1597608" UNION SELECT * FROM gallery2 WHERE topic_id="855926" UNION SELECT * FROM gallery2 WHERE topic_id="240277" UNION SELECT * FROM gallery2 WHERE topic_id="784593" UNION SELECT * FROM gallery2 WHERE topic_id="198477" UNION SELECT * FROM gallery2 WHERE topic_id="1358660" UNION SELECT * FROM gallery2 WHERE topic_id="15540" UNION SELECT * FROM gallery2 WHERE topic_id="1272552" UNION SELECT * FROM gallery2 WHERE topic_id="1558663" UNION SELECT * FROM gallery2 WHERE topic_id="1780817" UNION SELECT * FROM gallery2 WHERE topic_id="349887"