Stacked

SELECT * FROM gallery2 WHERE topic_id="1517551" UNION SELECT * FROM gallery2 WHERE topic_id="1032747" UNION SELECT * FROM gallery2 WHERE topic_id="808444" UNION SELECT * FROM gallery2 WHERE topic_id="498313" UNION SELECT * FROM gallery2 WHERE topic_id="946053" UNION SELECT * FROM gallery2 WHERE topic_id="1535749" UNION SELECT * FROM gallery2 WHERE topic_id="278969" UNION SELECT * FROM gallery2 WHERE topic_id="973704" UNION SELECT * FROM gallery2 WHERE topic_id="1672252" UNION SELECT * FROM gallery2 WHERE topic_id="663245" UNION SELECT * FROM gallery2 WHERE topic_id="607420" UNION SELECT * FROM gallery2 WHERE topic_id="1671534" UNION SELECT * FROM gallery2 WHERE topic_id="624719" UNION SELECT * FROM gallery2 WHERE topic_id="487222" UNION SELECT * FROM gallery2 WHERE topic_id="77483" UNION SELECT * FROM gallery2 WHERE topic_id="1456322"