Have an inout hidden field if question to previous radio button is checked or clicked

How do I code the following:

If a previous radio button is clicked then I want an input type hidden field to take place

I'm using javascript and coldfusion
gaby22Asked:
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tim_csCommented:
Hopefully this is helpful.

<script language="javascript">

 function buttClicked(button, radioChoice, field)
       {


             var hidField = eval("document.test." + field);
             radButton = eval("document.test." + button)
             hidField.value = radButton[radioChoice].value;

       }

 </script>

<form name="test">
 <input type="radio" name="buttonN" id="butt1" value="butt1" onClick="buttClicked('buttonN', '0' ,'hidden1');">
 <input type="radio" name="buttonN" id="butt1" value="butt2" onClick="buttClicked('buttonN', '1' ,'hidden1');">

 <input type="hidden" name="hidden1" value="">

</form>

This will set the value of a hidden field with the value of the button field. If you need something different let me know.
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CFDevHeadCommented:
previous radio button from the same page???
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gaby22Author Commented:
yes same page
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