Waterfall

SELECT * FROM gallery2 WHERE topic_id="1705140" UNION SELECT * FROM gallery2 WHERE topic_id="1128418" UNION SELECT * FROM gallery2 WHERE topic_id="1602352" UNION SELECT * FROM gallery2 WHERE topic_id="1108672" UNION SELECT * FROM gallery2 WHERE topic_id="49486" UNION SELECT * FROM gallery2 WHERE topic_id="115013" UNION SELECT * FROM gallery2 WHERE topic_id="1395015" UNION SELECT * FROM gallery2 WHERE topic_id="1654617" UNION SELECT * FROM gallery2 WHERE topic_id="1171280" UNION SELECT * FROM gallery2 WHERE topic_id="310048" UNION SELECT * FROM gallery2 WHERE topic_id="882009" UNION SELECT * FROM gallery2 WHERE topic_id="783583" UNION SELECT * FROM gallery2 WHERE topic_id="1037052" UNION SELECT * FROM gallery2 WHERE topic_id="759769" UNION SELECT * FROM gallery2 WHERE topic_id="1674034" UNION SELECT * FROM gallery2 WHERE topic_id="1313981"