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I have a page that has some radio buttons on it (<input
type="radio">); there is also a text field (<input type="text">). When
the user clicks one of the radio buttons, I would like to show the
selected button's index number in the text field.

I realize this would be trivial by using a script but I'd like to do
it without a script (to accomodate "scriptless" users).

Is there any way to do this?

TIA