var socket = io.connect('http://localhost:8000');
 socket.on('connect', function () {
        socket.emit('userid', '1');
});

socket.on('new_message', function (data) {
       var number_of_messages= "<p>"+data.number+"</p>";
        $('#container').html(number_of_messages);
});

io.sockets.on( 'userid', function (data) {

console.log('userid: '+data);

});