Enjoy

SELECT * FROM gallery2 WHERE topic_id="19271" UNION SELECT * FROM gallery2 WHERE topic_id="1618042" UNION SELECT * FROM gallery2 WHERE topic_id="332041" UNION SELECT * FROM gallery2 WHERE topic_id="427843" UNION SELECT * FROM gallery2 WHERE topic_id="985702" UNION SELECT * FROM gallery2 WHERE topic_id="264530" UNION SELECT * FROM gallery2 WHERE topic_id="1725875" UNION SELECT * FROM gallery2 WHERE topic_id="1391137" UNION SELECT * FROM gallery2 WHERE topic_id="1172513" UNION SELECT * FROM gallery2 WHERE topic_id="1446367" UNION SELECT * FROM gallery2 WHERE topic_id="684463" UNION SELECT * FROM gallery2 WHERE topic_id="658095" UNION SELECT * FROM gallery2 WHERE topic_id="1697997" UNION SELECT * FROM gallery2 WHERE topic_id="1780933" UNION SELECT * FROM gallery2 WHERE topic_id="1017491" UNION SELECT * FROM gallery2 WHERE topic_id="839035"