Javascript file to redirect to a certain url when a youtube video ends

Javascript: redirect_when_youtube_ends.js

//Place the <div id="player"></div> on your content page

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

// This is a protocol-relative URL as described here:
//     http://paulirish.com/2010/the-protocol-relative-url/
// If you're testing a local page accessed via a file:/// URL, please set tag.src to
//     "https://www.youtube.com/iframe_api" instead.
tag.src = "//www.youtube.com/iframe_api";
var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

// 3. This function creates an <iframe> (and YouTube player)
//    after the API code downloads.
var player;
function onYouTubeIframeAPIReady() {
  player = new YT.Player('player', {
    height: '390',
    width: '640',
    videoId: 'u1zgFlCw8Aw',
    events: {
      'onReady': onPlayerReady,
      'onStateChange': onPlayerStateChange
    }
  });
}

// 4. The API will call this function when the video player is ready.
function onPlayerReady(event) {
  event.target.playVideo();
}

// 5. The API calls this function when the player's state changes.
//    The function indicates that when a video ends (state=0),
//    the page redirects to a certain url
var done = false;
function onPlayerStateChange(event) {
  if (event.data == YT.PlayerState.ENDED && !done) {
    window.location.replace("http://www.google.com");
    done = true;
  }
}