Reselect A Radiobutton On The Fly?

Say you have some radiobuttons.

Code:
<select id="word1" name="word1">
<option value="0" selected>Bears
<option value="1">Pears
<option value="2">Pearls
<option value="3">Purrs
etc.

The first-time display shows the "selected" option (value=0)("Bears"). Later, when the user makes a different choice, say "Purrs", and I have reason to reset the user's choice to another one, say 2, how do I do it? To change its value to, say 2, I would do as follows:

[Code]....