var eventList = document.querySelector('#events');

  var iframe = document.querySelector('iframe');

​

  window.addEventListener('message', receiveMessage, false);

​

function receiveMessage(event) {

  var eventItem = document.createElement('li');

  eventItem.textContent = JSON.stringify(event.data, null, '  ');

  eventList.appendChild(eventItem);

​

  if (event.data.name === 'ready') {

    var playMessage = {

      sender: 'gov2001',

      name: 'play'

    };

​

    iframe.contentWindow.postMessage(playMessage, '*');

  }

}

​