Sorry, while it may be true; we have regulations and a TOS to follow here.
Unless we can get some clear truth that this site has actually been hacked, and that it is okay to hack it back to it's original condition from the site admin, we can not help you.
We can not take part in illegal activities here. Now, you should also keep in mind that you are posting on a forum that is publicly available, and asking people to help you hack a site. You should be cautious, and not do such things anyways.
1. No system is safe.
2. Aim for the the impossible.
3. Have fun in cyberspace and meatspace.
For those that know