www.zfire.com/js/countTo.js

$(document).ready(function (){
 	var win = $(window).height();
 	var height = $('.counter').offset().top;
   	var Counter = 1;
   	$(window).scroll(function () {
		if($(document).scrollTop() < (height-win+100) && Counter==1){
			$('.counter').each(function(){
				var dataperc = $(this).attr('data-perc');
				$(this).delay(5000).countTo({
					from: 0,
					to: dataperc,
					speed: 5000,
					refreshInterval: 100
				});
				Counter = 0;
			});
		}
	});
});
$.fn.countTo = function(options) {
	// merge the default plugin settings with the custom options
	options = $.extend({}, $.fn.countTo.defaults, options || {});

	// how many times to update the value, and how much to increment the value on each update
	var loops = Math.ceil(options.speed / options.refreshInterval),
		increment = (options.to - options.from) / loops;

	return $(this).delay(1000).each(function() {
		var _this = this,
			loopCount = 0,
			value = options.from,
			interval = setInterval(updateTimer, options.refreshInterval);

		function updateTimer() {
			value += increment;
			loopCount++;
			$(_this).html(value.toFixed(options.decimals));

			if (typeof(options.onUpdate) == 'function') {
				options.onUpdate.call(_this, value);
			}

			if (loopCount >= loops) {
				clearInterval(interval);
				value = options.to;

				if (typeof(options.onComplete) == 'function') {
					options.onComplete.call(_this, value);
				}
			}
		}
	});
};

$.fn.countTo.defaults = {
	from: 0,	// the number the element should start at
	to: 100,	// the number the element should end at
	speed: 1000,	// how long it should take to count between the target numbers
	refreshInterval: 100,	//how often the element should be updated
	decimals: 0,	//the number of decimal places to show
	onUpdate: null,	//callback method for every time the element is updated,
	onComplete: null,//callback method for when the element finishes updating
};