Viewers who paused "The Biggest Loser" TV show saw an ad saying "Jenny Craig says you've got more to lose!" If you used TiVo to pause "Iron Chef America" on the Food Network, this popped up: "Sub-Zero: Every cook deserves the best!""We were once a foe of the networks, now we've become a friend," said Tara Maitra, TiVo's general manager of content services and ad sales. "We're working with the industry ... to get users to engage in a world increasingly equipped to fast-forward through commercials." Dave Zatz, a 37-year-old network engineer in Herndon, Va., isn't happy about it because he bought a TiVo digital video recorder and pays a subscription to skip ads.