function number_format( number, decimals, dec_point, thousands_sep ) {

    var n = number, prec = decimals, dec = dec_point, sep = thousands_sep;
    n = !isFinite(+n) ? 0 : +n;
    prec = !isFinite(+prec) ? 0 : Math.abs(prec);
    sep = sep == undefined ? ',' : sep;

    var s = n.toFixed(prec),
        abs = Math.abs(n).toFixed(prec),
        _, i;

    if (abs > 1000) {
        _ = abs.split(/\D/);
        i = _[0].length % 3 || 3;

        _[0] = s.slice(0,i + (n < 0)) +
              _[0].slice(i).replace(/(\d{3})/g, sep+'$1');

        s = _.join(dec || '.');
    } else {
        s = abs.replace('.', dec_point);
    }

    return s;
}