Adapted version of formatMoney

Number.prototype.formatMoney.js

//From http://www.josscrowcroft.com/2011/code/format-unformat-money-currency-javascript/
// Extend the default Number object with a formatMoney() method:
// usage: someVar.formatMoney(decimalPlaces = 2) 
Number.prototype.formatMoney = function (places) {
    places = !isNaN(places = Math.abs(places)) ? places : 2;
    thousand = ",";
    decimal = ".";
    var number = this,
	    i = parseInt(number = Math.abs(+number || 0).toFixed(places), 10) + "",
	    j = (j = i.length) > 3 ? j % 3 : 0;
    return (j ? i.substr(0, j) + thousand : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + thousand) + (places ? decimal + Math.abs(number - i).toFixed(places).slice(2) : "");
};

Dropped the currency symbol and negative symbol, and defaulted the thousand and decimal seperators.