var from = 0;
var to = 90;
var duration = 400;
var start = new Date().getTime();
var element = $(el);
setTimeout(function() {
     var now = (new Date().getTime()) - start;
     var progress = now / duration;
     var result = (to - from) * progress + from;
     element.css('-o-transform', 'rotate('+result + 'deg)');
     element.css('-webkit-transform', 'rotate('+result + 'deg)');
     element.css('-ms-transform', 'rotate('+result + 'deg)');
     element.css('-moz-transform', 'rotate('+result + 'deg)');
     element.css('transform', 'rotate('+result + 'deg)');
     if (progress < 1)
         {setTimeout(arguments.callee, 10)}
     else
     {
   /*функция после окончания анимации*/
     };
}, 10);