Untitled

    <%= radio_button_tag 'registration_required', 'no'  %>No, my domain is already registered or I am going to handle it myself<br />
    <%= radio_button_tag 'registration_required', 'yes' %>Yes, please register my domain.<br />
    <span id="registration_info">

    </span>
    <script type="text/javascript">
      //<![CDATA[
        function check_rego(element, value) {
          if ($('registration_required_yes').checked == true) {
            new Element.show('registration_info');
          } else {
            new Element.hide('registration_info');
          }
          new Form.Element.EventObserver('registration_required_yes', check_rego);
          new Form.Element.EventObserver('registration_required_no', check_rego);
          return true;
        }
        check_rego();
      //]]>
    </script>