(Undated)  --  It's time to say goodbye to an old friend.  The NFL will wrap up its preseason starting tonight as the third week of exhibition games get underway.  Tomorrow, the Rams are in the Mile High city, taking on the Broncos in Denver.  Elsewhere, the Chargers take on the Seahawks in Seattle as the team sits a number of starters before their season opener on September 12th.  On Sunday, the Raiders and 49ers square off in Santa Clara, with questions remaining as to who will be the Week One starting quarterback for San Francisco.