Not perfect but acceptable ?

SELECT * FROM gallery2 WHERE topic_id="647506" UNION SELECT * FROM gallery2 WHERE topic_id="422230" UNION SELECT * FROM gallery2 WHERE topic_id="370835" UNION SELECT * FROM gallery2 WHERE topic_id="1226345" UNION SELECT * FROM gallery2 WHERE topic_id="768190" UNION SELECT * FROM gallery2 WHERE topic_id="1255631" UNION SELECT * FROM gallery2 WHERE topic_id="529855" UNION SELECT * FROM gallery2 WHERE topic_id="759107" UNION SELECT * FROM gallery2 WHERE topic_id="42504" UNION SELECT * FROM gallery2 WHERE topic_id="731003" UNION SELECT * FROM gallery2 WHERE topic_id="485617" UNION SELECT * FROM gallery2 WHERE topic_id="1211422" UNION SELECT * FROM gallery2 WHERE topic_id="303977" UNION SELECT * FROM gallery2 WHERE topic_id="1567004" UNION SELECT * FROM gallery2 WHERE topic_id="1422026" UNION SELECT * FROM gallery2 WHERE topic_id="1647248"