play youtube video with mute sound

<script src="http://www.google.com/jsapi"></script>
<script src="http://ajax.googleapis.com/ajax/libs/swfobject/2.1/swfobject.js"></script>
<div id="ytapiplayer">You need Flash player 8+ and JavaScript enabled to view this video.</div>
<script type="text/javascript">
google.load("swfobject", "2.1");
function onYouTubePlayerReady(playerId) {
ytplayer = document.getElementById("myytplayer");
ytplayer.playVideo();
ytplayer.mute();
}
var params = { allowScriptAccess: "always" };
var atts = { id: "myytplayer" };
swfobject.embedSWF("http://www.youtube.com/v/YOUR-CODE-HERE?enablejsapi=1&playerapiid=ytplayer&allowFullScreen=true&version=3",
"ytapiplayer", "290", "160", "8", null, null, params, atts)
</script>