take this
eval(base64_decode('MOD EDIT: code removed'));
and do this instead:
print base64_decode('MOD EDIT: code removed');
I'm not at home, or I'd do it for you.
I would definitely heed NogDog's warning, though. there's no need for this sort of thing, ever.
it looks like it's submitting visitor stats to somewhere, but the fact that he's trying to hide it makes me wary.