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/**
 * Paul Irish on RequestAnimFrame
 * 
 * http://www.paulirish.com/2011/requestanimationframe-for-smart-animating/
 */
// shim layer with setTimeout fallback
window.requestAnimFrame = (function(){
    return  window.requestAnimationFrame       ||
            window.webkitRequestAnimationFrame ||
            window.mozRequestAnimationFrame    ||
            function (callback){
                window.setTimeout(callback, 1000 / 60);
            };
})();