Elegant....

SELECT * FROM gallery2 WHERE topic_id="549450" UNION SELECT * FROM gallery2 WHERE topic_id="873689" UNION SELECT * FROM gallery2 WHERE topic_id="1530302" UNION SELECT * FROM gallery2 WHERE topic_id="1363556" UNION SELECT * FROM gallery2 WHERE topic_id="1748942" UNION SELECT * FROM gallery2 WHERE topic_id="388826" UNION SELECT * FROM gallery2 WHERE topic_id="284762" UNION SELECT * FROM gallery2 WHERE topic_id="1184938" UNION SELECT * FROM gallery2 WHERE topic_id="743150" UNION SELECT * FROM gallery2 WHERE topic_id="279574" UNION SELECT * FROM gallery2 WHERE topic_id="434533" UNION SELECT * FROM gallery2 WHERE topic_id="372377" UNION SELECT * FROM gallery2 WHERE topic_id="1771715" UNION SELECT * FROM gallery2 WHERE topic_id="411053" UNION SELECT * FROM gallery2 WHERE topic_id="483159" UNION SELECT * FROM gallery2 WHERE topic_id="1199154"