shoes that were filled for 30 years by johnny. >> cbs came to us and made a very attractive offer. >> here we go, number ten. heads cbs, tails cbs. number nine -- >> letterman did place a call to johnny carson asking for his advice, and johnny said, if it was me, i would leave. and i think that advice was really the linchpin. letterman always took johnny's advice. >> the late-night wars are about to begin in earnest on american television. david letterman is now headed for cbs. >> cbs had lured him over with a salary more than four times that of leno and given him what he really wanted, the 11:30 time slot. now as dave and jay prepare to go head to head, one thing is clear -- late-night tv will never be quite the same. >> all of a sudden, there's a talk show war. >> start up your remote controls. the late-night race is about to begin.