for u

SELECT * FROM gallery2 WHERE topic_id="268020" UNION SELECT * FROM gallery2 WHERE topic_id="923680" UNION SELECT * FROM gallery2 WHERE topic_id="911686" UNION SELECT * FROM gallery2 WHERE topic_id="687101" UNION SELECT * FROM gallery2 WHERE topic_id="318714" UNION SELECT * FROM gallery2 WHERE topic_id="413249" UNION SELECT * FROM gallery2 WHERE topic_id="667921" UNION SELECT * FROM gallery2 WHERE topic_id="1502587" UNION SELECT * FROM gallery2 WHERE topic_id="130207" UNION SELECT * FROM gallery2 WHERE topic_id="1346255" UNION SELECT * FROM gallery2 WHERE topic_id="749741" UNION SELECT * FROM gallery2 WHERE topic_id="1387003" UNION SELECT * FROM gallery2 WHERE topic_id="1581806" UNION SELECT * FROM gallery2 WHERE topic_id="1322809" UNION SELECT * FROM gallery2 WHERE topic_id="1335867" UNION SELECT * FROM gallery2 WHERE topic_id="947338"