Brett Favre was on the Vikings' practice field on Tuesday, wearing a red No. 4 jersey, presumably making some type of deal with backup QB John David Booty, the number?s previous owner. Booty has switched to No. 9. Favre walked through a throng of media in shoulder pads and shorts, as were the rest of the Vikings. He shook hands with several coaches and teammates, including LBs Ben Leber and Chad Greenway, and G Steve Hutchinson, before beginning warm ups and stretching. Sage Rosenfels, wearing a ballcap and no pads, doesn?t appear to be practicing.