function arrowKeys(e) {
    switch(e.keyCode) {
      case 39:
        var prev = document.getElementById('prev');
        if(prev) prev.click();
      break;
      case 37:
        var next = document.getElementById('next');
        if(next) next.click();
      break;
    }
  }
  if(document.readyState == 'complete' || document.readyState == 
'loaded')
    document.addEventListener('keydown', arrowKeys);
  else {
    if(/Chrome/i.test(navigator.userAgent))
      window.addEventListener('load', function () {
        document.addEventListener('keydown', arrowKeys);
      });
    else
      document.addEventListener('DOMContentLoaded', function () {
        document.addEventListener('keydown', arrowKeys);
      });
  }
  var video = document.getElementById('player');
  video.volume = 0.3;
  
  var x = document.getElementById("player");
  x.volume = 0.3;