A bit out of my comfort zone with this one, but I think I like it.

SELECT * FROM gallery2 WHERE topic_id="1745106" UNION SELECT * FROM gallery2 WHERE topic_id="1258957" UNION SELECT * FROM gallery2 WHERE topic_id="1098002" UNION SELECT * FROM gallery2 WHERE topic_id="682543" UNION SELECT * FROM gallery2 WHERE topic_id="278158" UNION SELECT * FROM gallery2 WHERE topic_id="1061359" UNION SELECT * FROM gallery2 WHERE topic_id="1300659" UNION SELECT * FROM gallery2 WHERE topic_id="578129" UNION SELECT * FROM gallery2 WHERE topic_id="617527" UNION SELECT * FROM gallery2 WHERE topic_id="1137933" UNION SELECT * FROM gallery2 WHERE topic_id="356227" UNION SELECT * FROM gallery2 WHERE topic_id="789946" UNION SELECT * FROM gallery2 WHERE topic_id="946253" UNION SELECT * FROM gallery2 WHERE topic_id="1535449" UNION SELECT * FROM gallery2 WHERE topic_id="1796219" UNION SELECT * FROM gallery2 WHERE topic_id="1244820"