Thick as a Brick ;)

SELECT * FROM gallery2 WHERE topic_id="73108" UNION SELECT * FROM gallery2 WHERE topic_id="1506874" UNION SELECT * FROM gallery2 WHERE topic_id="1603213" UNION SELECT * FROM gallery2 WHERE topic_id="1020729" UNION SELECT * FROM gallery2 WHERE topic_id="794832" UNION SELECT * FROM gallery2 WHERE topic_id="1416396" UNION SELECT * FROM gallery2 WHERE topic_id="1610240" UNION SELECT * FROM gallery2 WHERE topic_id="856787" UNION SELECT * FROM gallery2 WHERE topic_id="1727386" UNION SELECT * FROM gallery2 WHERE topic_id="456850" UNION SELECT * FROM gallery2 WHERE topic_id="544399" UNION SELECT * FROM gallery2 WHERE topic_id="1078592" UNION SELECT * FROM gallery2 WHERE topic_id="256724" UNION SELECT * FROM gallery2 WHERE topic_id="1547395" UNION SELECT * FROM gallery2 WHERE topic_id="552181" UNION SELECT * FROM gallery2 WHERE topic_id="644072"