I think I'm missing something...

SELECT * FROM gallery2 WHERE topic_id="541048" UNION SELECT * FROM gallery2 WHERE topic_id="1338459" UNION SELECT * FROM gallery2 WHERE topic_id="36398" UNION SELECT * FROM gallery2 WHERE topic_id="189053" UNION SELECT * FROM gallery2 WHERE topic_id="1628239" UNION SELECT * FROM gallery2 WHERE topic_id="126653" UNION SELECT * FROM gallery2 WHERE topic_id="1020601" UNION SELECT * FROM gallery2 WHERE topic_id="1518900" UNION SELECT * FROM gallery2 WHERE topic_id="1729478" UNION SELECT * FROM gallery2 WHERE topic_id="1076373" UNION SELECT * FROM gallery2 WHERE topic_id="1826971" UNION SELECT * FROM gallery2 WHERE topic_id="1349752" UNION SELECT * FROM gallery2 WHERE topic_id="1765869" UNION SELECT * FROM gallery2 WHERE topic_id="756482" UNION SELECT * FROM gallery2 WHERE topic_id="905175" UNION SELECT * FROM gallery2 WHERE topic_id="1454014"