First of all, I am in no way affiliated with this website. As a matter of fact, I just stumbled across this about five minutes ago and have yet to even try it myself, so I have no idea if/how it works, yet.

Anyway, there looks like there are two versions of this: a downloadable one and a web version. They both appear to be free. I've clicked on the web version. Initially, it looks promising.

Check it out if you want to.

Party Poker Hand History Replayer

EDIT: It doesn't seem to like Firefox, but after trying it in IE, I'm pretty impressed.