insertamos el video
<script type="text/javascript" src="swfobject.js"></script>
 <div id="ytapiplayer">
   Se necesita una versión de Flash Player superior a 8
	y javascript, para ver este video.
 </div>

 <script type="text/javascript">

   var params = { allowScriptAccess: "always" };
   var atts = { id: "myytplayer" };
   swfobject.embedSWF("http://www.youtube.com/v/VIDEO_ID&enablejsapi=1&playerapiid=ytplayer",
                      "ytapiplayer", "425", "356", "8", null, null, params, atts);
 </script>



 function onYouTubePlayerReady(playerId) {
      ytplayer = document.getElementById("myytplayer");
    }






</script>

<a href="javascript:ytplayer.playVideo()">Reproducir</a>