I've added simple chime sounds for WebKit (based on the WebAudio API)

   if('webkitAudioContext' in window) AC = new webkitAudioContext();
   else Actx = null;
...
   if(AC) sound(440, .3);
...
function sound(f, g) {
   var osc = AC.createOscillator();
   osc.frequency.value = f;
   var gain = AC.createGainNode();
   osc.connect(gain);
   gain.connect(AC.destination);
   gain.gain.value = g;
   gain.gain.setTargetAtTime(0, AC.currentTime, .1);
   osc.start(AC.currentTime );
   osc.stop(AC.currentTime + .5);
}