$sql = "SELECT i.image_id, i.cat_id, i.user_id, i.image_name, i.image_active, i.image_media_file, i.image_thumb_file, u.user_name, l.user_id, l.lightbox_lastaction, l.lightbox_image_ids
FROM (".LIGHTBOXES_TABLE." l,".IMAGES_TABLE." i,".USERS_TABLE." u)
WHERE i.image_active = 1 AND i.cat_id NOT IN (".get_auth_cat_sql("auth_viewcat", "NOTIN").") AND l.user_id = u.user_id AND i.image_id = l.lightbox_image_ids
LIMIT $light_activity_num";