49ers backup QB Alex Smith injured his surgically repaired right shoulder this week and is doubtful for tomorrow's game. That means Shaun Hill will be the back-up and that Michael Robinson would be the emergency back-up. Here's a quote from Mike Nolan: "Yesterday Alex Smith sustained a non-contact injury to his surgically repaired right shoulder. He will be consulting with his surgeon in Birmingham for treatment recommendations. At this time there are no specifics to the injury or a timetable."