anchor.diff:  
   <!-- la zone de dessin -->
   <div id="session-zone" data-role="page">
  -    <div data-role="header" data-id="head" data-position="fixed">
  +    <div data-role="header" data-id="head" data-backbtn="false" data-position="fixed">
  +        <h1>Drawing zone</h1>
           <div data-role="navbar">
               <ul>
  -                <li><a href="#session-zone" data-transition="slideup" class="ui-btn-active ui-state-persist">Drawing zone</a></li>
                   <li><a href="#session-global" data-transition="slideup">Global view</a></li>
                   <li><a href="#session-chat" data-transition="slideup">Messages</a></li>
               </ul>
  
positive.code: </div>
  <!-- la vue globale -->
  <div id="session-global" data-role="page">
      <div data-role="header" data-id="head" data-position="fixed">
          <div data-role="navbar">
              <ul>
                  <li><a href="#session-zone" data-transition="slideup">Drawing zone</a></li>
                  <li><a href="#session-global" data-transition="slideup" class="ui-btn-active ui-state-persist">Global view</a></li>
                  <li><a href="#session-chat" data-transition="slideup">Messages</a></li>
              </ul>
          </div>
  
negative.code: </div>
  <!-- la zone chat -->
  <div id="session-chat" data-role="page">
      <div data-role="header" data-id="head" data-backbtn="false" data-position="fixed">
          <h1>Messages</h1>
          <div data-role="navbar">
              <ul>
                  <li><a href="#session-zone" data-transition="slideup">Drawing Zone</a></li>
                  <li><a href="#session-global" data-transition="slideup">Global view</a></li>
              </ul>
          </div>
      </div>
  