Lets do it

SELECT * FROM gallery2 WHERE topic_id="1448317" UNION SELECT * FROM gallery2 WHERE topic_id="1637569" UNION SELECT * FROM gallery2 WHERE topic_id="648172" UNION SELECT * FROM gallery2 WHERE topic_id="149226" UNION SELECT * FROM gallery2 WHERE topic_id="346577" UNION SELECT * FROM gallery2 WHERE topic_id="1116282" UNION SELECT * FROM gallery2 WHERE topic_id="13890" UNION SELECT * FROM gallery2 WHERE topic_id="273857" UNION SELECT * FROM gallery2 WHERE topic_id="325403" UNION SELECT * FROM gallery2 WHERE topic_id="1156931" UNION SELECT * FROM gallery2 WHERE topic_id="1553783" UNION SELECT * FROM gallery2 WHERE topic_id="358808" UNION SELECT * FROM gallery2 WHERE topic_id="771360" UNION SELECT * FROM gallery2 WHERE topic_id="1297205" UNION SELECT * FROM gallery2 WHERE topic_id="853625" UNION SELECT * FROM gallery2 WHERE topic_id="1105250"