empty your [3]

SELECT * FROM gallery2 WHERE topic_id="400884" UNION SELECT * FROM gallery2 WHERE topic_id="1085780" UNION SELECT * FROM gallery2 WHERE topic_id="1322095" UNION SELECT * FROM gallery2 WHERE topic_id="157851" UNION SELECT * FROM gallery2 WHERE topic_id="1827426" UNION SELECT * FROM gallery2 WHERE topic_id="1625736" UNION SELECT * FROM gallery2 WHERE topic_id="108845" UNION SELECT * FROM gallery2 WHERE topic_id="77063" UNION SELECT * FROM gallery2 WHERE topic_id="1621567" UNION SELECT * FROM gallery2 WHERE topic_id="568641" UNION SELECT * FROM gallery2 WHERE topic_id="523924" UNION SELECT * FROM gallery2 WHERE topic_id="1482477" UNION SELECT * FROM gallery2 WHERE topic_id="1810080" UNION SELECT * FROM gallery2 WHERE topic_id="299970" UNION SELECT * FROM gallery2 WHERE topic_id="1093126" UNION SELECT * FROM gallery2 WHERE topic_id="1798774"