anchor.diff:                  <% scenes.each do |scene| %>
                       <button class="nav-scene" id="current-scene"><%= "SCENE " + currScene.to_s %></button>
                       <script>
  -                        document.getElementById('current-scene').id = '<%= escape_javascript "s" + currIndex.to_s %>';
  +                        document.getElementById('current-scene').id = '<%= escape_javascript "ns" + currIndex.to_s %>';
                       </script>
                       
                       <% currScene = currScene + 1 %>
  
positive.code:         function showScene(scene) {
              var allScenes = document.getElementsByClassName("scenehead");
              for (var i = 0; i < allScenes.length; i++) {
                  if (allScenes[i].id == scene.target.id) {
                      allScenes[i].setAttribute("style", "background-color: yellow");
                  }
              }
          }
  
negative.code:             <% acts.each do |act| %>
                  <button class="nav-act" id="current-act"><%= "ACT " + currAct.to_s %></button>
                  <script>
                      document.getElementById('current-act').id = '<%= escape_javascript "na" + currAct.to_s %>';
                  </script>
  
                  <% currAct = currAct + 1 %>
  