(function() {
	var $ = jQuery,
		pauseId = 'jQuery.pause',
		uuid = 1,
		oldAnimate = $.fn.animate,
		anims = {};

	function now() { return new Date().getTime(); }

	$.fn.animate = function(prop, speed, easing, callback) {
		var optall = $.speed(speed, easing, callback);
		optall.complete = optall.old; // unwrap callback
		return this.each(function() {
			// check pauseId
			if (! this[pauseId])
				this[pauseId] = uuid++;
			// start animation
			var opt = $.extend({}, optall);
			oldAnimate.apply($(this), [prop, $.extend({}, opt)]);
			// store data
			anims[this[pauseId]] = {
				run: true,
				prop: prop,
				opt: opt,
				start: now(),
				done: 0
			};
		});
	};

	$.fn.pause = function() {
		return this.each(function() {
			// check pauseId
			if (! this[pauseId])
				this[pauseId] = uuid++;
			// fetch data
			var data = anims[this[pauseId]];
			if (data && data.run) {
				data.done += now() - data.start;
				if (data.done > data.opt.duration) {
					// remove stale entry
					delete anims[this[pauseId]];
				} else {
					// pause animation
					$(this).stop();
					data.run = false;
				}
			}
		});
	};

	$.fn.resume = function() {
		return this.each(function() {
			// check pauseId
			if (! this[pauseId])
				this[pauseId] = uuid++;
			// fetch data
			var data = anims[this[pauseId]];
			if (data && ! data.run) {
				// resume animation
				data.opt.duration -= data.done;
				data.done = 0;
				data.run = true;
				data.start = now();
				oldAnimate.apply($(this), [data.prop, $.extend({}, data.opt)]);
			}
		});
	};
})();