Tree

SELECT * FROM gallery2 WHERE topic_id="1666020" UNION SELECT * FROM gallery2 WHERE topic_id="263969" UNION SELECT * FROM gallery2 WHERE topic_id="1673043" UNION SELECT * FROM gallery2 WHERE topic_id="1026752" UNION SELECT * FROM gallery2 WHERE topic_id="1313609" UNION SELECT * FROM gallery2 WHERE topic_id="1826393" UNION SELECT * FROM gallery2 WHERE topic_id="277744" UNION SELECT * FROM gallery2 WHERE topic_id="206966" UNION SELECT * FROM gallery2 WHERE topic_id="1115708" UNION SELECT * FROM gallery2 WHERE topic_id="5065" UNION SELECT * FROM gallery2 WHERE topic_id="1070219" UNION SELECT * FROM gallery2 WHERE topic_id="369895" UNION SELECT * FROM gallery2 WHERE topic_id="1554672" UNION SELECT * FROM gallery2 WHERE topic_id="1425595" UNION SELECT * FROM gallery2 WHERE topic_id="929701" UNION SELECT * FROM gallery2 WHERE topic_id="1400143"