Outline :)

SELECT * FROM gallery2 WHERE topic_id="1346253" UNION SELECT * FROM gallery2 WHERE topic_id="535750" UNION SELECT * FROM gallery2 WHERE topic_id="853635" UNION SELECT * FROM gallery2 WHERE topic_id="731330" UNION SELECT * FROM gallery2 WHERE topic_id="1565876" UNION SELECT * FROM gallery2 WHERE topic_id="1194875" UNION SELECT * FROM gallery2 WHERE topic_id="1447647" UNION SELECT * FROM gallery2 WHERE topic_id="1137977" UNION SELECT * FROM gallery2 WHERE topic_id="735507" UNION SELECT * FROM gallery2 WHERE topic_id="62988" UNION SELECT * FROM gallery2 WHERE topic_id="910101" UNION SELECT * FROM gallery2 WHERE topic_id="1043506" UNION SELECT * FROM gallery2 WHERE topic_id="1822850" UNION SELECT * FROM gallery2 WHERE topic_id="886205" UNION SELECT * FROM gallery2 WHERE topic_id="1685738" UNION SELECT * FROM gallery2 WHERE topic_id="448794"