Javascript currency formating with comma decimal separation

currency.js

function number_to_money(num, currency) {
    currency = typeof currency !== 'undefined' ? currency : '$';
    return currency + ' ' + num.toFixed(2).replace('.', ',').replace(/(?=(\d{3})+\,)/g, '.').replace(/^\./,'');
};

var numbers = [1, 12, 123, 1234, 12345, 123456, 1234567, 12345.67];

for (var i = 0; i < numbers.length; i++) {
    document.write(number_to_money(numbers[i], 'R$') + '<br />');
};