Toggle YouTube Embed Video - http://stackoverflow.com/a/8668741
/*
* @param String state. play or pause
*/
function toggleVideo(state) {
var div = document.getElementById("popup-video");
var iframe = div.getElementsByTagName("iframe")[0].contentWindow;
func = state == 'pause' ? 'pauseVideo' : 'playVideo';
iframe.postMessage('{"event":"command", "func":"' + func + '", "args":""}', '*');
}