Mute volume after video plays once

<script type="text/javascript">
var player;

function onYouTubeIframeAPIReady() {
	player = new YT.Player('mbYTP_bgndVideo99', {
		events: {'onStateChange': onPlayerStateChange }
	});
}
function onPlayerStateChange(event) {
	switch(event.data) {
		case 0:
		player.mute();
                player.playVideo();
		break;	
	}
}
     </script>