number to currency formatting

formatCurrency.js

/* formatCurrency.js - number to currency formatting
 * @author - Livingston Samuel
 */

var formatCurrency = function (num, separator, decimal) {
	var format_separator = separator || ",",
		decimal_separator = decimal || ".",
		parts = parseFloat(num, 10).toString().split(decimal_separator);

	parts[0] = parts[0].split("").reverse().join("").match(/(\d{1,3})/g).join(format_separator).split("").reverse().join("");

	if (parts.length === 1) {
		parts[1] = "00";
	} else {
		part[1] = part[1].substr(0, 2);
	}

	return Number.prototype.toFixed.call(parts.join(decimal_separator), 2);
};

/* EXAMPLE USAGE

formatCurrency(100000) => 100,000.00
formatCurrency(1234567890.98) => 1,234,567,890.98
formatCurrency(1234567890.98, ".", ".") => 1.234.567.890,98
formatCurrency(1234567890.987654321) => 1,234,567,890.98

*/