gistfile1.txt

var app = require('http').createServer(handler)
  , io = require('socket.io').listen(app)
  , fs = require('fs')

app.listen(8137);

function handler (req, res) {
  fs.readFile(__dirname + '/template.html',
  function (err, data) {
    if (err) {
      res.writeHead(500);
      return res.end('Error loading index.html');
    }

    res.writeHead(200);
    res.end(data);
  });
}

io.sockets.on('connection', function (socket) {
  socket.on('message', function(msg) {
    console.log(msg);
    socket.broadcast.emit(msg);
  });
});

////////////////////
client side
////////////////////

    <script type="text/javascript" src="/socket.io/socket.io.js"></script>
    <script type="text/javascript">
      $(document).ready(function() {
        var entry_el = $('#entry');
        var socket = io.connect('ws://mywebsite.com:8137');

        socket.on('connect', function() {
          console.log('connected.');
        });

        socket.on('message', function(msg) {
          var data = msg.replace(/&/g,"&amp;").replace(/</g,"&lt;").replace(/>/g,"&gt;");
          $('#log ul').append('<li>' + data + '</li>');
          window.scrollBy(0, 1000000000000000);
          entry_el.focus();
        });

        entry_el.keypress(function(event) {
          if (event.keyCode != 13) return;

          var msg = entry_el.attr('value');
          if (msg) {
            socket.send(msg);
            entry_el.attr('value', '');
          }
        });
      });
    </script>