anchor.diff:  <script src="https://code.jquery.com/jquery-1.11.1.js"></script>
   
   <script>
  +
   // $(function(){
     var username, change_room, user_rooms;
     if (currentUser != undefined){
  
positive.code:     });
    };
    
    var data = {username: username};
    socket.emit('user config', data);
  
    $('#top').on('click', function(){
  
negative.code:       username.join();
      };
    };
    var data = {username: username};
  
    window.socket_room = "lobby";
    window.userName = $("span.current_user").text() || "Anonymous";
  