Kevin Eubanks

NBC's Jay Leno on Thursday mocked his employers over rumors that his new program is about to be canceled.During the opening monologue of "The Jay Leno Show," the comedian joked about having spoken to CBS "Evening News" host Katie Couric: "You know, she left NBC for another network. I gotta give her a call, see how that's working out."The former "Tonight Show" host then suggested that if he does…