Dilemma with Radio Buttons

A colleague asked me if there is a way to set the radio buttons so that you
may deselect them without making an alternate choice.  For example, we don't
want to have anything selected as a default, then someone goes to the item
and selects one item.

It seems that the only way to deselect it is to select another.  But we
don't want that.  We want to CLEAR ONLY this field (since it might be a
mistake) without clearing the entire form.  Is there any way to either:
a) program that in  OR
b) instruct the user how to deselect it.

Your help, as always, is greatly appreciated.  I can't send the URL for the
page since it isn't up yet.
Kate Pollara

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