Edit in JSFiddle

var date, interval, tada = new Audio('http://soundbible.com/grab.php?id=2084&type=mp3');
function setDate(timestamp) {
    date = new Date(Date.UTC(2013, 10, 24, 12, 0, 0, 0) + timestamp * 1000);
    clearInterval(interval);
    setInterval(update, 5000);
    update();
}

function update() {
    $('#d').text($.timeago(date));
}

var socket = new FIMKSocket("wss://cloud.mofowallet.org:7986/ws/");
socket.ready(function () {
    
    /* Get the initial blockchain height and time */
    socket.getBlockchainState(null, function (data) {
        $('#h').text(data.height);
        setDate(data.timestamp);
        tada.play();
    });
    
    /* Listen for new blocks */    
    socket.subscribe("blockPushed", function (data) {
        $('#h').text(data.height);
        setDate(data.timestamp);
        tada.play();
    });
});

<div class="row">
  <div class="col-xs-12">
      <h3>FIMK WebSocket Widget</h3>
      <span class="text-muted">Current block is at height</span>&nbsp;<span id="h"></span><br>
      <span class="text-muted">This block arrived</span>&nbsp;<span id="d"></span><br>
  </div>
</div>