lightbox not working

Hi The lightbox does not seem to work – in admin section have – REL attribute, lightbox, i presume it uses the wordpress lightbox that comes with the wordpress package, do i need to add accss class and what is it?
see page
http://photohunters.org/photohunters/topic/flash-minolta/

https://ww.wp.xz.cn/plugins/gd-bbpress-attachments/