></script>
	<script src="plugin/chalkboard/plugin.js"></script>

    <script>
      function extend() {
        var target = {};
        for (var i = 0; i < arguments.length; i++) {
          var source = arguments[i];
          for (var key in source) {
            if (source.hasOwnProperty(key)) {
              target[key] = source[key];
            }
          }
        }
        return target;
      }

      // default options to init reveal.js
      var defaultOptions = {
        controls: true,
      