Autotab function

Hi, I currently have a website with a golf score entry form. At present, to move between fields, users must use TAB. I'd like a javascript function that allows them to move focus as they enter a character in each field. Here's the tricky bit though - since they could either score a 1 or a 10, there needs to be logic to either have a popup or some other mechanism to clarify which is scored. Anything starting with any other integer should be fine to move to the next field. This will take a javascript guru about 15 minutes to do, but I'm no javascript guru, hence the project. I've attached the source of the page that will require this. Got lots of other projects like this if successful.