anchor.diff:  <div class="whitespace" id="default_level">
   <h4>Default access</h4>
   <%= twitter_bootstrap_form_for @mediaobject, 
  -      html: { 
  -	class: "form-horizontal",
  -    	id: 'access_control_form' } do |vid| %>
  +  html: { class: "form-horizontal",
  +  id: 'access_control_form'}  do |vid| %>
       <%= hidden_field_tag :donot_advance, true %>
       <%= hidden_field_tag :step, @active_step %>
       <%= vid.hidden_field :pid %>
  
positive.code:       <% unless @mediaobject.user_exceptions.empty? %>
        <thead>
          <tr>
             <td rowspan="2" class="info">Users</td>
          </tr>
       </thead>
          <tbody>
             <tr>
            <td class="span1">Remove</td>
            <td>&nbsp;</td>
          </tr>
            <% @mediaobject.user_exceptions.each do |user| %>
         <tr>
            <td class="span1"><%= check_box_tag 'users[]', user %></td>
            <td><%= user %></td>
          </tr>
        <% end %>
        </tbody>
  
negative.code: 
      <div class="whitespace" id="exceptions">
      <h4>Exceptions</h4>
      <%= twitter_bootstrap_form_for @mediaobject, 
        html: { class: "form-vertical",
      id: 'exceptions'} do %>
          <%= hidden_field_tag :donot_advance, true %>
          <%= hidden_field_tag :step, @active_step %>
      <table class="table table-striped table-hover">
        <% unless @mediaobject.group_exceptions.empty? %>
         <thead>
          <tr>
             <td class="info">Groups</td>
          </tr>
       </thead>
          <tbody>
          <% @mediaobject.group_exceptions.each do |group| %>
          <tr>
            <td>
              <%= label_tag do %>
                <%= check_box_tag 'groups[]', group %>
                <%= group %>
              <% end %>
          </tr>
        <% end %>
        </tbody>
  