site/_includes/header.html

<nav class="navbar navbar-default navbar-fixed-top" role="navigation">
  <hr id="status_bar">
  <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 class="divider-vertical"></li>
        <li><a href="/blog.html">Logbuch</a></li>
        <li class="divider-vertical"></li>
        <li><a href="/#about">&Uuml;ber uns</a></li>
        <li class="divider-vertical"></li>
        <li><a href="#contact">Kontakt</a></li>
        <li class="divider-vertical"></li>
        <li><a href="https://wiki.chaospott.de">Wiki</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) {
              $( "#status_open" ).css( "display", "block" );
              $( "#status_bar" ).css( "borderColor", "#5CB85C" );
            } else {
              $( "#status_closed" ).css( "display", "block" );
              $( "#status_bar" ).css( "borderColor", "#D9534F" );
	          }
          });
        </script>
        <li id="status_open">
          <a href="status.html" style="color:#5CB85C !important;">
            Raum offen
          </a>
        </li>
        <li id="status_closed">
          <a href="status.html">
            Raum geschlossen
          </a>
        </li>
      </ul>
    </div>
  </div>
</nav>