function updateHTML(elmId, value) {
          document.getElementById(elmId).innerHTML = value;
        }

        function setytplayerState(newState) {
          updateHTML("playerstate", newState);
        }

        function onYouTubePlayerReady(playerId) {
          ytplayer = document.getElementById("myytplayer");
          setInterval(updateytplayerInfo, 250);
          updateytplayerInfo();
          ytplayer.addEventListener("onStateChange", "onytplayerStateChange");
          ytplayer.addEventListener("onError", "onPlayerError");
        }

        function onytplayerStateChange(newState) {
          setytplayerState(newState);
        }

        function onPlayerError(errorCode) {
          alert("An error occured: " + errorCode);
        }

        function updateytplayerInfo() {
          updateHTML("bytesloaded", getBytesLoaded());
          updateHTML("bytestotal", getBytesTotal());
          updateHTML("videoduration", getDuration());
          updateHTML("videotime", getCurrentTime());
          updateHTML("startbytes", getStartBytes());
          updateHTML("volume", getVolume());
        }