The San Francisco 49ers will be without starting left tackle for the next six weeks due to a sprained PCL and MCL in his right knee.  Staley has started all 7 games for the Niners this season so Alex Smith better have eyes in the back of his head when he drops back to throw the ball.  Barry Sims will replace Staley in the starting lineup.  He has played in all 7 games for the Niners this season but he hasn’t started any games.