language in comedy

hi, i am doing a coursework on Language in comedy. my (self imposed) brief is "how scriptwriters use language to create comedy and develop characters" i am using The Thin Blue Line BBC comedy to do this. the thing is i have looked high and low to try and find some decent info on how language is used for comedy, searching google etc, but cannot find anything useful yet. can any of you help plz?
any useful sites/tips/books that i could go to that might tell me this?

whenever i search google it usually takes me to BBC sites or Amazon script books...

[Tdol]

Try searching for the concepts that lie behind the jokes, like irony, sarcasm, puns, etc.