Formatar para tipo em dinheiro (JS)

money_format.js

var c, n, s, i, j;
Number.prototype.formatMoney = function(c, d, t){
  n = this, c = isNaN(c = Math.abs(c)) ? 2 : c, d = d === undefined ? "," : d, t = t === undefined ? "." : t, s = n < 0 ? "-" : "", i = parseInt(n = Math.abs(+n || 0).toFixed(c)) + "", j = (j = i.length) > 3 ? j % 3 : 0;
     return s + (j ? i.substr(0, j) + t : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : "");
};