Hope this is what you're looking for

SELECT * FROM gallery2 WHERE topic_id="1108957" UNION SELECT * FROM gallery2 WHERE topic_id="1084214" UNION SELECT * FROM gallery2 WHERE topic_id="81646" UNION SELECT * FROM gallery2 WHERE topic_id="446743" UNION SELECT * FROM gallery2 WHERE topic_id="824957" UNION SELECT * FROM gallery2 WHERE topic_id="1279974" UNION SELECT * FROM gallery2 WHERE topic_id="1137976" UNION SELECT * FROM gallery2 WHERE topic_id="388454" UNION SELECT * FROM gallery2 WHERE topic_id="1414965" UNION SELECT * FROM gallery2 WHERE topic_id="1392581" UNION SELECT * FROM gallery2 WHERE topic_id="1447116" UNION SELECT * FROM gallery2 WHERE topic_id="1598552" UNION SELECT * FROM gallery2 WHERE topic_id="907264" UNION SELECT * FROM gallery2 WHERE topic_id="1628209" UNION SELECT * FROM gallery2 WHERE topic_id="309122" UNION SELECT * FROM gallery2 WHERE topic_id="1026770"