requestAnimationFrame polyfill by Erik Möller. fixes from Paul Irish and Tino Zijdel refactored by Yannick Albert

rAF.js

// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating
 
// requestAnimationFrame polyfill by Erik Möller. fixes from Paul Irish and Tino Zijdel
// refactored by Yannick Albert
 
// MIT license
(function(window) {
    var equestAnimationFrame = 'equestAnimationFrame',
        requestAnimationFrame = 'r' + equestAnimationFrame,
        
        ancelAnimationFrame = 'ancelAnimationFrame',
        cancelAnimationFrame = 'c' + ancelAnimationFrame,
        
        expectedTime = 0,
        vendors = ['moz', 'ms', 'o', 'webkit'],
        vendor;
    
    while(!window[requestAnimationFrame] && (vendor = vendors.pop())) {
        window[requestAnimationFrame] = window[vendor + 'R' + equestAnimationFrame];
        window[cancelAnimationFrame] = window[vendor + 'C' + ancelAnimationFrame] || window[vendor + 'CancelR' + equestAnimationFrame];
    }
    
    if(!window[requestAnimationFrame]) {
        window[requestAnimationFrame] = function(callback) {
            var currentTime = new Date().getTime(),
                adjustedDelay = 16 - (currentTime - expectedTime),
                delay = adjustedDelay > 0 ? adjustedDelay : 0;
            
            expectedTime = currentTime + delay;
            
            return setTimeout(function() {
                callback(expectedTime);
            }, delay);
        };
        
        window[cancelAnimationFrame] = clearTimeout;
    }
}(this));

rAF.min.js

// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating
 
// requestAnimationFrame polyfill by Erik Möller. fixes from Paul Irish and Tino Zijdel
// refactored by Yannick Albert
 
// MIT license
(function(c){var b="equestAnimationFrame",f="r"+b,a="ancelAnimationFrame",e="c"+a,d=0,h=["moz","ms","o","webkit"],g;while(!c[f]&&(g=h.pop())){c[f]=c[g+"R"+b];c[e]=c[g+"C"+a]||c[g+"CancelR"+b]}if(!c[f]){c[f]=function(l){var k=new Date().getTime(),i=16-(k-d),j=i>0?i:0;d=k+j;return setTimeout(function(){l(d)},j)};c[e]=clearTimeout}}(this));

Thanks for working on this : ) What is the browser support?