I'm not great with js myself, but happy to give you my thoughts for
whatever they're worth.

Which javascript library are you using (prototype/jQuery)?  I find a
lot of people, including myself, don't always rely on the helper
instead preferring to work with their chosen js library direct.

I've recently switched to jQuery and have a form with a group of radio
buttons and use the following to watch for a particular value being
selected to then display a group of extra fields or hide if that
option is unselected.

Form Field:
echo $form->input('CampaignSignature.postal_address_id', array(
  'type'=>'radio',
  'onclick'=>'sectionToggle(this, \'#new-address\')',
));

Self written function echoed out at bottom of same view:
<script>
// <![CDATA[
  function sectionToggle(field, section) {
    if ($(field).val() == 'new') {
      $(section).show();
    } else {
      $(section).hide();
    }
  }
// ]]>
</script>

Hope this helps, all you'd have to change for prototype is the $
(field).val() == 'new' line of the function to $(field).getValue() ==
'new'.

Paul

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