How to display currency in Javascript?

Number.prototype.formatMoney = function (c, d, t) {
    var 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) : "");
};

//Usage: 

(123456789.12345).formatMoney(2, '.', ',');

http://stackoverflow.com/questions/149055/how-can-i-format-numbers-as-money-in-javascript