Radio Button FF Fix

gistfile1.html

<fieldset><span class="default">Customizable?
  <input type="radio" name="customizable" id="cust_y" value="Yes" action="open#custom" /> 
    <label for="cust_y" class="default">Yes</label>
  <input type="radio" name="customizable" id="cust_n" value="No" action="open#normal" />
    <label for="cust_n" class="default">No</label></span>
</fieldset>