iframe yt 2

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    var tag = document.createElement('script');

    tag.src = "https://www.youtube.com/iframe_api";

    var firstScript = document.getElementsByTagName('script')[0];

    firstScript.parentNode.insertBefore(tag, firstScript);

    function onYouTubeIframeAPIReady() {

        new YT.Player('player', {

            events: {

                'onStateChange': function(evt) {

                    if (evt.data === YT.PlayerState.ENDED) {

                        document.getElementById('manual-optin-trigger').click();

                    }

                 }

             }

        });

    }

</script>