anchor.diff:  </div>
   <% if can? :manage, :bulk_update %>
       <ul class="nav nav-tabs">
  -      <li class="<%= "active" if @tab == 'missions' %>">
  +      <li class="<%= 'active' if @tab == 'missions' %>">
           <a href="<%=  course_missions_path %>?_tab=main" data-toggle="tab"><h4>Missions</h4></a>
         </li>
  -      <li class="<%= "active" if @tab == 'overview' %>">
  +      <li class="<%= 'active' if @tab == 'overview' %>">
           <a href="<%= course_missions_overview_path %>" data-toggle="tab"><h4>Overview</h4></a>
         </li>
       </ul>
  
positive.code:   <% end%>
    </tbody>
  </table>
      <div class="center">
        <button class="btn btn-large" style="width: 50%; font-weight: bold">Update</button>
      </div>
  <% end %>
  
negative.code:   </tr>
    </thead>
    <tbody>
      <% @missions.each do |mission| %>
      <% mission = mission.specific %>
        <tr>
          <td>
            <input name="missions[<%= mission.id %>][title]" class="input-medium" type="text"  value="<%= mission.title %>" required>
  