Phaser.RequestAnimationFrame = function (game, forceSetTimeOut){ 
if (typeof forceSetTimeOut === 'undefined') { 
forceSetTimeOut = false ; 
} 
this.game = game; 
this.isRunning = false ; 
this.forceSetTimeOut = forceSetTimeOut; 
var vendors = ['ms', 'moz', 'webkit', 'o'] ; 
for (var x = 0; 
x < _AN_Read_length('length', vendors) && !window.requestAnimationFrame; x++ ){ 
window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame']; 
window.cancelAnimationFrame = window[vendors[x] + 'CancelAnimationFrame']; 
} 
this._isSetTimeOut = false ; 
this._onLoop = null ; 
this._timeOutID = null ; 
} 
; 
Phaser.RequestAnimationFrame.prototype = { 
start: function (){ 
this.isRunning = true ; 
var _this = this; 
if (!window.requestAnimationFrame || this.forceSetTimeOut) { 
this._isSetTimeOut = true ; 
this._onLoop = function (){ 
return _this.updateSetTimeout(); 
} 
; 
this._timeOutID = _AN_Call_settimeout('setTimeout', window, this._onLoop, 0); 
} 
 else { 
this._isSetTimeOut = false ; 
this._onLoop = function (time){ 
return _this.updateRAF(time); 
} 
; 
this._timeOutID = window.requestAnimationFrame(this._onLoop); 
} 
} 
,
updateRAF: function (){ 
this.game.update(Date.now()); 
this._timeOutID = window.requestAnimationFrame(this._onLoop); 
} 
,
updateSetTimeout: function (){ 
this.game.update(Date.now()); 
this._timeOutID = _AN_Call_settimeout('setTimeout', window, this._onLoop, this.game.time.timeToCall); 
} 
,
stop: function (){ 
if (this._isSetTimeOut) { 
clearTimeout(this._timeOutID); 
} 
 else { 
window.cancelAnimationFrame(this._timeOutID); 
} 
this.isRunning = false ; 
} 
,
isSetTimeOut: function (){ 
return this._isSetTimeOut; 
} 
,
isRAF: function (){ 
return (this._isSetTimeOut === false ); 
} 
}
; 
Phaser.RequestAnimationFrame.prototype.constructor = Phaser.RequestAnimationFrame;