Well, if it was going to do anything to your iPad, its too late now, isn't it?
First off, it did not install anything on the iPad. Can't do that from a web site on an iOS device. The only thing you might consider is to clear your browser cache and data: Open Settings app > Safari:
- Clear History
- Clear Cookies and Data
- And if you are really the paranoid type, Advanced > Website Data > Remove All Website Data.