site/_includes/header.html

<nav class="navbar navbar-default navbar-fixed-top" role="navigation">
  <hr id="status_bar" style="margin:0; border-width:4px 0px;">
  <div class="container">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target=".navbar-collapse">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
    </div>
    <div class="navbar-collapse collapse">
      <ul class="nav navbar-nav">
        <li><a href="/">Home</a></li>
        <li><a href="/blog.html">Logbuch</a></li>
        <li><a href="/#about">&Uuml;ber uns</a></li>
        <li><a href="#contact">Kontakt</a></li>
      </ul>
      <ul class="nav navbar-nav navbar-right">
        <script>
          $.getJSON("http://status.chaospott.de/status.json").done(function(data) {
            if(data.state.open) {
              document.getElementById('status_open').style.display='block';
              document.getElementById('status_bar').style.borderColor='#00ff00';
            } else {
              document.getElementById('status_closed').style.display='block';
              document.getElementById('status_bar').style.borderColor='#ff0000';
	          }
          });
        </script>
        <li id="status_open" style="display:none; border-right:0;">
          <a href="#" style="color:#00ff00 !important;">
            Raum: offen
          </a>
        </li>
        <li id="status_closed" style="display:none;">
          <a href="#" style="color:#ff0000;">
            Raum: geschlossen
          </a>
        </li>
      </ul>
    </div>
  </div>
</nav>