michael@0: var rfa = null;
michael@0: if (window.requestAnimationFrame) {
michael@0:   rfa = requestAnimationFrame;
michael@0: } else if (window.mozRequestAnimationFrame) {
michael@0:   rfa = mozRequestAnimationFrame;
michael@0: } else if (window.webkitRequestAnimationFrame) {
michael@0:   rfa = webkitRequestAnimationFrame;
michael@0: } else if (window.msRequestAnimationFrame) {
michael@0:   rfa = msRequestAnimationFrame;
michael@0: } else if (window.oRequestAnimationFrame) {
michael@0:   rfa = oRequestAnimationFrame;
michael@0: }
michael@0: 
michael@0: function animate(params, count) {
michael@0:   rfa(function() {
michael@0:     animateStep(params, count);
michael@0:   });
michael@0: }
michael@0: 
michael@0: function animateStep(params, count) {
michael@0:   if (!count) {
michael@0:     document.documentElement.removeAttribute("class");
michael@0:     return;
michael@0:   }
michael@0:   var rel = document.getElementById("rel");
michael@0:   for (prop in params) {
michael@0:     rel.style[prop] = (parseInt(rel.style[prop]) + params[prop]) + "px";
michael@0:   }
michael@0:   rfa(function() {
michael@0:     animateStep(params, count - 10);
michael@0:   });
michael@0: }