[thelist] Radio selection showing results in text box

[Annie]

I was given a form created by a client. The purpose of the form is to have
the user select one of three or four checkboxes, each assigned a score.
Right now, the user has to check the scoring chart and type the score into
the text box beside the checkbox. Once done, the user clicks the Tally
button, which then tallies the score in another text box, and in one more
text box below this assigns a percentage to the score based on the total
possible. Don't know if you needed all that info, but here's my question:
When the user clicks on the radio button, I'd like the appropriate score for
that radio button to show up in the corresponding text box automatically.
Anyone know how? :P

TIA

Annie