NAPA Javon Walker smiled and chatted up himself and his role entering in his first year with the Raiders. But he's not talking about being robbed, beaten and left unconscious on a Las Vegas street last month. Members of the Raiders' offense stretch during Thursday's training camp opener in Napa. New wide receiver Javon Walker was among the participants. Raiders wide receiver Javon Walker, above, impressed second-year quarterback JaMarcus Russell on the first day of training camp. ...