what do u think?

SELECT * FROM gallery2 WHERE topic_id="721788" UNION SELECT * FROM gallery2 WHERE topic_id="606039" UNION SELECT * FROM gallery2 WHERE topic_id="408180" UNION SELECT * FROM gallery2 WHERE topic_id="71875" UNION SELECT * FROM gallery2 WHERE topic_id="1540523" UNION SELECT * FROM gallery2 WHERE topic_id="865407" UNION SELECT * FROM gallery2 WHERE topic_id="791855" UNION SELECT * FROM gallery2 WHERE topic_id="92628" UNION SELECT * FROM gallery2 WHERE topic_id="1193722" UNION SELECT * FROM gallery2 WHERE topic_id="1600673" UNION SELECT * FROM gallery2 WHERE topic_id="246429" UNION SELECT * FROM gallery2 WHERE topic_id="705629" UNION SELECT * FROM gallery2 WHERE topic_id="1711266" UNION SELECT * FROM gallery2 WHERE topic_id="679398" UNION SELECT * FROM gallery2 WHERE topic_id="1129595" UNION SELECT * FROM gallery2 WHERE topic_id="51123"