I looked at the source code of your page; the last line of your page includes the following:
Code:
http://eurotracker.org/counter/new1/index.php
(note: don't visit this site unless you have good protection against Trojan viruses!)
It's in an invisible (0x0 pixel) popup. I figured it might be some sort of site-visitation tracker, but when I went to that address directly, the Trojan popped up again. That's your culprit.
Obviously, if that's something that has been added by your web provider, I'd dump them immediately (you could possibly even sue them).
Since you've donated to The Acaeum, now might be an excellent opportunity to make use of your free space.

Switching your DNS entry will only take 24-48 hrs, too.
Foul