Format Money Number

format-money.js

Number.prototype.formatMoney = function(c, d, t){
  c = isNaN(c = Math.abs(c)) ? 2 : c;
  d = d == undefined ? "." : d;
  t = t == undefined ? "," : t;

  var n = this;
  var s = n < 0 ? "-" : "";
  var i = String(parseInt(n = Math.abs(Number(n) || 0).toFixed(c)));
  var 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) : "");
};