Rank them

SELECT * FROM gallery2 WHERE topic_id="87545" UNION SELECT * FROM gallery2 WHERE topic_id="1463387" UNION SELECT * FROM gallery2 WHERE topic_id="328029" UNION SELECT * FROM gallery2 WHERE topic_id="1430133" UNION SELECT * FROM gallery2 WHERE topic_id="39852" UNION SELECT * FROM gallery2 WHERE topic_id="238408" UNION SELECT * FROM gallery2 WHERE topic_id="1547520" UNION SELECT * FROM gallery2 WHERE topic_id="587986" UNION SELECT * FROM gallery2 WHERE topic_id="1571168" UNION SELECT * FROM gallery2 WHERE topic_id="806309" UNION SELECT * FROM gallery2 WHERE topic_id="790529" UNION SELECT * FROM gallery2 WHERE topic_id="1063153" UNION SELECT * FROM gallery2 WHERE topic_id="1265723" UNION SELECT * FROM gallery2 WHERE topic_id="1261000" UNION SELECT * FROM gallery2 WHERE topic_id="1683264" UNION SELECT * FROM gallery2 WHERE topic_id="39820"