WASHINGTON (AP) -- The comedian who kept NBC viewers entertained on Thursday nights well after "The Cosby Show" was gone will salute bill cosby when he receives the nation's top humor prize. Jerry Seinfeld will honor Cosby on Oct. 26 with the Mark Twain Prize for American Humor at the John F. Kennedy Center for the Performing Arts in Washington. The center announced the lineup Thursday and says the event will be broadcast nationally Nov. 4