Viking receiver Bernard Berrian is day to day with a sore toe on his right foot.  He's a question mark to play Saturday night at home against Pittsburgh.  The Vikings host the Steelers at 7pm Saturday night, pregame on AM 1390-the Fan at 6pm.  Berrian missed last Saturday's game at Baltimore with that same toe injury.  Quarterback Tarvaris Jackson is wearing a custom made brace on his injured right knee and didn't take part in team workouts Tuesday.  Jackson has a strained right MCL in his right knee that he sustained in Baltimore last Saturday.