I’ve only used the jsapi once, but I think you have to add an id to the end of your src string like this:
http://www.youtube.com/e/VIDEO_ID?enablejsapi=1&version=3&playerapiid=ytplayer
Then catching the reference to the player:
function onYouTubePlayerReady(playerId) {
ytplayer = document.getElementById("myytplayer");
}
But the problem with this is that the video is loaded in an iframe and communicating becomes tricky. I haven’t tried this before but here’s a possible solution: