function getAudio(player) {
	return player.getElementsByTagName("audio")[0];
}

window.onload = function() {
	var players = document.getElementsByClassName("player");
	for (var i = 0; i < players.length; i++) {
		getAudio(players[i])["queue"] = i;
		getAudio(players[i]).addEventListener('ended', function(event) {
			const next = event.target["queue"] + 1;
			if (next < players.length) getAudio(players[next]).play();
		});
	}
}