generic time-based tween with easing support

tween.js

!function ($) {

  function tween(duration, from, to, tween, ease) {
		ease = ease || function (t) {
			return t;
		}
	  var self = this,
	  time = duration || 1000,
	  animDiff = to - from,
	  startTime = new Date(),
	  timer = setInterval(animate, 5);

	  function animate () {
	    var diff = new Date() - startTime;
	    if (diff > time) {
	      tween(to);
	      clearInterval(timer);
	      timer = null;
	      return;
	    }
	    tween((animDiff * ease(diff / time)) + from);
	  }
	}

  $.ender({tween: tween});

}(ender)