MySQL Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-15,15' at line 1

MySQL Query: SELECT post_id,post_time,user_name,post_title,post_text,post_image,pref_image,image_url FROM nemesis_news LEFT JOIN nemesis_users ON user_id=post_user LEFT JOIN nemesis_news_images ON image_id=post_image WHERE post_time<=1337450900 ORDER BY post_time DESC LIMIT -15,15