Problem with Address Bar and CSS

I have a client who setup wordpress and then purchased a additional domain. When she setup wordpress she used http://thatnight.net/AST/. Now when she sets up her new domain name (astalphapi.com) as a addon domain it just redirects to the http://thatnight.net/AST/ address.

I went into phpmyadmin and searched for the term http://thatnight.net/AST/ and replaced it with http://astalphapi.com but it still redirects and now the css doesn’t seem to show up properly. Even after I change it back to http://thatnight.net/AST/ it still doesn’t show up properly.

Anyone have any idea on whats going on?