function formatCurrency(num) {
	num = num.toString().replace(/\$|\,/g,'');
	
	if(isNaN(num)) {
		num = "0";
	}
	
	sign = (num == (num = Math.abs(num)));
	num = Math.floor(num * 100 + 0.50000000001);
	cents = num%100;
	num = Math.floor(num / 100).toString();
	
	if(cents < 10) {
		cents = "0" + cents;
	}
	
	for(var i = 0; i < Math.floor((num.length - (1 + i)) / 3); i++) {
		num = num.substring(0, num.length-(4*i+3))+','+ num.substring(num.length - (4 * i + 3));
	}
	
	return (((sign) ? '' : '-') + '$' + num + '.' + cents);
}