requestAnimFrame_pi

requestAnimFrame_pi

/*
     * Request new frame by Paul Irish.
     * 60 FPS.
     */
    
    window.requestAnimFrame = (function() {
     
        return  window.requestAnimationFrame       || 
                window.webkitRequestAnimationFrame || 
                window.mozRequestAnimationFrame    || 
                window.oRequestAnimationFrame      || 
                window.msRequestAnimationFrame     || 
              
                function(callback) {
              
                    window.setTimeout(callback, 1000 / FPS);
                
                };
              
    })();