Thousands comma separator

price_format.js

var price_format = (function () {
	var rgx = /(\d+)(\d{3})/;
	
	return function (nStr) {
		var x = String(nStr).split('.'),
			x1 = x[0],
			x2 = x.length > 1 ? '.' + x[1] : '';
			
		while (rgx.test(x1)) {
			x1 = x1.replace(rgx, '$1' + ',' + '$2');
		}
		
		return x1 + x2;
	}

}());