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<script>
  var videoIDs = ['lzlYzTLaSHY','QiEi9f-f16Q','t-4w8GQPZSc'];

  $('<script>')
    .attr('src', 'https://www.youtube.com/iframe_api')
    .appendTo($('script')[0]);
  // 2. This code loads the IFrame Player API code asynchronously.
//  var tag = document.createElement('script');

//  tag.src = "https://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() {
	  // show thumbnails
	  $(function(){
	  	// get thumbnail
	  	var getVideoThumbnail = function(vid) {
	 	  return "http://i1.ytimg.com/vi/"+vid+"/mqdefault.jpg";
		};

	  	var $parent = $('#thumbnails');
	  	videoIDs.forEach(function(item, idx){
	  	  var $li = $('<li>');
	  	  $li.appendTo($parent);
	  	  $('<img>')
	  	  	.attr('src', getVideoThumbnail(item))
	  	  	.appendTo($li)
	  	  	.data('vid', item)
	  	  	.on('click', thumbnailClick);
	  	});
    });
  }

  function thumbnailClick(event) {
  	var vid = $(this).data('vid');
  	if( player ){
  	  player.loadVideoById({videoId:vid});
  	}else{	
	  player = new YT.Player('player', {
        height: '390',
        width: '640',
        videoId: vid,
        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 playing a video (state=1),
  //    the player should play for six seconds and then stop.
  var done = false;
  function onPlayerStateChange(event) {
    if (event.data == YT.PlayerState.PLAYING && !done) {
      setTimeout(stopVideo, 6000);
      done = true;
    }
  }
  function stopVideo() {
    player.stopVideo();
  }
}</script>