Without

SELECT * FROM gallery2 WHERE topic_id="779509" UNION SELECT * FROM gallery2 WHERE topic_id="153772" UNION SELECT * FROM gallery2 WHERE topic_id="1504890" UNION SELECT * FROM gallery2 WHERE topic_id="1663098" UNION SELECT * FROM gallery2 WHERE topic_id="756255" UNION SELECT * FROM gallery2 WHERE topic_id="845653" UNION SELECT * FROM gallery2 WHERE topic_id="1549228" UNION SELECT * FROM gallery2 WHERE topic_id="1811250" UNION SELECT * FROM gallery2 WHERE topic_id="436490" UNION SELECT * FROM gallery2 WHERE topic_id="1141241" UNION SELECT * FROM gallery2 WHERE topic_id="335887" UNION SELECT * FROM gallery2 WHERE topic_id="1412924" UNION SELECT * FROM gallery2 WHERE topic_id="1763054" UNION SELECT * FROM gallery2 WHERE topic_id="705872" UNION SELECT * FROM gallery2 WHERE topic_id="1515966" UNION SELECT * FROM gallery2 WHERE topic_id="577918"