Animate Number

function animateNumber(element, endValue, endTime){
	var now = new Date().getTime(),
		timeLeft = endTime - now;

	if ( timeLeft > 0 ){
		//element must be a jQuery object
		var isInput = element.is('input'),
			currentValue = isInput ? parseInt(element.val().replace(',','')) : parseInt(element.html().replace(',','')),
			newValue = currentValue,
			done = false,
			interval = 25;

		if ( isNumber(currentValue) ) {
			var diff = Math.abs( endValue - currentValue ),
				increment = 1000,
				thou = diff.toString().slice(-4,-3);
				hund = diff.toString().slice(-3,-2);
				ten = diff.toString().slice(-2,-1);
				one = diff.toString().slice(-1),
				steps = thou + hund + ten + one,
				interval = timeLeft / steps;

				if ( diff < 10 ) {
					increment = 1;
				} else if ( diff < 100 ) {
					increment = 10;
				} else if ( diff < 1000 ) {
					increment = 100;
				}

			if ( currentValue < endValue ) {
				//counting up
				if ( currentValue + increment >= endValue ) {
					//at or close to end
					newValue = endValue;
					done = true;
				} else {
					newValue += increment;
				}
			} else if ( currentValue > endValue ) {
				//counting down
				if ( currentValue + increment <= endValue ) {
					//at or close to end
					newValue = endValue;
					done = true;
				} else {
					newValue -= increment;
				}
			}
		} else {
			//couldn't parse existing text as number just set the end value
			newValue = endValue;
			done = true;
		}


	} else {
		//time's up just set the end value
		newValue = endValue;
		done = true;
	}

	//set new value
	if ( isInput ){
		element.val(numberWithCommas(newValue));
	} else {
		element.html(numberWithCommas(newValue));
	}

	if ( !done ) {
		setTimeout( function() { animateNumber(element, endValue, endTime) }, interval);
	}
}