text: function playSound() {
  	if (typeof(audio) != "undefined" && audio) {
  		audio.pause();
  		document.body.removeChild(audio);
  		audio = null;
  	}
  	audio = document.createElement('audio');
  	document.body.appendChild(audio);
  	audio.autoplay = true;
  	audio.src = chrome.extension.getURL('assets/tada.mp3');
  	audio.play();
  }
  
  chrome.extension.onMessage.addListener(function(message, sender, sendResponse) {
      if (message && message.type == 'playSound') {
          playSound();
          sendResponse(true);
      }
  });