To play randomly, add the songs like this:
init ([ 'http://demo.com/songs/song1.mp3, 'http://demo.com/songs/song2.mp3, 'http://demo.com/songs/song3.mp3 ]);
Use the following to play randomly using Math.random:
function displayRandom() { var audio = Math.floor(Math.random() * (collection.length)); audio = collection[audio]; audio.play(); setTimeout(loop,audio.duration*1000); }