(function() {
  var i, lastTime, len, vendor, vendors;

  lastTime = 0;

  vendors = ['webkit', 'moz'];

  for (i = 0, len = vendors.length; i < len; i++) {
    vendor = vendors[i];
    if (!(!window.requestAnimationFrame)) {
      continue;
    }
    window.requestAnimationFrame = window[vendor + "RequestAnimationFrame"];
    window.cancelAnimationFrame = window[vendor + "CancelAnimationFrame"] || window[vendor + "CancelRequestAnimationFrame"];
  }

  if (!window.requestAnimationFrame) {
    window.requestAnimationFrame = function(callback, element) {
      var currTime, id, timeToCall;
      currTime = Date.now();
      timeToCall = Math.max(0, 16 - (currTime - lastTime));
      id = setTimeout(function() {
        return callback(currTime + timeToCall);
      }, timeToCall);
      lastTime = currTime + timeToCall;
      return id;
    };
  }

  if (!window.cancelAnimationFrame) {
    window.cancelAnimationFrame = window.clearTimeout;
  }

}).call(this);