since these pics uploaded by users of the forum cant anyone use then in their site? see http://forum.xcitefun.net/ and it says, In this Forum You can Download files??
Read the terms of service of the site and see if they're required to grant a license when they upload them. But even then be careful, and there's no guarantee they're legally allowed to grant that license in the first place (they have to be the copyright holder of the actual image to do so).