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/*
* @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":""}', '*');
}