Warrick Dunn underwent surgery for a herniated disc in his back and he will likely miss the next six weeks.  Dunn might miss the start of the 2007 football season so Jerious Norwood better be ready to carry a heavy workload early in the season.  Dunn also had shoulder surgery last January as his body seems to be wearing down from the beating he has been taking.  Dunn played in all 16 games last season and he carried the ball 286 times for 1,140 yards (4.0 ypc) with 4 TD runs.  He also caught 22 passes for 170 yards (7.7 avg) with 1 TD grab.