Goto sxoc.com
If you have antivirus program it will bring up a Backdoor:PHP/BackConnect.A
As I work with PHP everyday, being an IT technician I got curious and decided to investigate.
I found a file in Google Chrome's cache which contains just over 4500 lines of PHP (Weird, as PHP is server side it should never get to your PC, which is why I'm not sure their attempt has fully worked)
You have a PHP Shell on the server (Not sure if it is live, but it is an attempt at one, I'm not sure if it has worked).
It has references to "Antisecurityteam".
Also on the homepage is some links to porn sites. (Can be seen in the source but not on the page as they are moved left of the screen. (about -99999px))
The PHP script also has an email address in there - "fullyukle.com@gmail.com" - Where it "reports home" a big chunk of information.
Again, I know it's coming from your homepage, (The forum looks clean), I'm not sure if the shell is running, but it is definitely there and needs looking at