// 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: 'M7lc1UVf-VE', 
            events: { 
              'onReady': onPlayerReady, 
              'onStateChange': onPlayerStateChange 
            } 
          }); 
        }