gistfile1.txt

## application.js
 
  trigger_visibility_callbacks = function() {
    $$(".conditional").each(function(e) {
      eval(e.id + "_callback")
    });
  }
 
## view.html.erb

<% form_for @foo do |f| %>
  
  <h1>Question One</h1>
  <p>Lorem ipsum dolor sit amet?</p>
  
  <%= f.radio_button(:question_one, "yes", :onchange => "trigger_visibility_callbacks" %> Yes
  <%= f.radio_button(:question_one, "no", :onchange => "trigger_visibility_callbacks" %> No
  <%= f.radio_button(:question_one, "maybe", :onchange => "trigger_visibility_callbacks" %> Maybe


  <!-- conditional div one -->
  <div class="conditional" id="question_one_a">
    Questicant ipsum floor?
  </div>
  <script type="text/javascript">
    question_one_a_callback = function() {
      self = $('question_one_a');
      $F('question_one').value == "yes" ? self.show() : self.hide();
    }
  </script>

  <!-- conditional div two -->
   <div class="conditional" id="question_one_b">
    Gleeple Glarble Bleeply Boogle?
  </div>
  <script type="text/javascript">
    question_one_b_callback = function() {
      self = $('question_one_b');
      $F('question_one').value == "no" ? self.show() : self.hide();
    }
  </script>

<% end %>