var ytplayer = false;
function onYouTubePlayerReady(playerId) {
      ytplayer = document.getElementById("myytplayer");
    }
function pause() {
  if (ytplayer) {
    ytplayer.pauseVideo();
  }
}

function play() {
  if (ytplayer) {
    ytplayer.playVideo();
  }
}

function hideDiv(id) {
if (document.getElementById) { // DOM3 = IE5, NS6
document.getElementById(id).style.visibility = 'hidden';
}
else {
if (document.layers) { // Netscape 4
document.id.visibility = 'hidden';
}
else { // IE 4
document.all.id.style.visibility = 'hidden';
}
}
}

function showDiv(id) {
if (document.getElementById) { // DOM3 = IE5, NS6
document.getElementById(id).style.visibility = 'visible';
}
else {
if (document.layers) { // Netscape 4
document.id.visibility = 'visible';
}
else { // IE 4
document.all.id.style.visibility = 'visible';
}
}
}