I love the design! The only thing I recommend is to try to incorporate the forum into the main site's design, or atleast keep the header image constant between the two.
Its too much of black involved you can use some margins on left and right to make it little more attractive. Otherwise concept is good.... good luck
I like the concept especially since you have Cro Cop on the main page(Go Croatia) ...the only thing is that you might have too much black though, but other than that I like it! Keep it up!