What if a candidate doesn't concede?

I really am curious to know the answer to this. We here in Florida are dealing with an election for a congressional seat currently held by what some consider to be a mad man who is refusing to concede defeat and has taken his demand for a recount to two courts which have both turned him down. He lost the election by about 2500 votes and 1.1 % of the vote, but according to news reports is still planning to appeal the court decision and refuses to concede. And I am just wondering what the legal and regulatory ramifications are. If he continues to refuse to concede, how is he thrown out of the congress and how and when does the winner take his seat? Does the Supervisor of Elections have any power? or does the Governor? the party? How is such an election settled?