Hi Sibannac, how are you.
I've done a little google on it meself, and I have to confess, I don't quite fully understand the ins and outs of whats happened here, but from what I gather, the message at the top of your page is some sort of flash animation I think, and the problem arises from trying to resolve a DNS to an IP or something, there is loads more about it on that link that Raz provided.
I understand that its not something directed at you personally, but is probably part of a mass attack, and its just unfortunate that your domain was one of the ones affected.
(Incidentally, I've just visited it, and I can't see the banner. Has it been removed?)