var cultures = [];
cultures[0] = { n: 'es-ES', dp: 2, ds: ',', ts: '.', cs: '€', ns: '-' };
Number.prototype.formatCurrency = function(decimalPoints, currencyCulture) {{
    if (this == null) return null;
    var cultureIndex = 0;
    if (currencyCulture != undefined) {
        for (i = 0; i < cultures.length; i++) {
            if (cultures[i].n == currencyCulture) {
                cultureIndex = i;
                break;
            }
        }
    }
    var value = this,
    decimalPoints = isNaN(decimalPoints = Math.abs(decimalPoints)) ? cultures[cultureIndex].dp : decimalPoints,
    decimalSeparator = decimalSeparator == undefined ? cultures[cultureIndex].ds : decimalSeparator,
    thousandSeparator = thousandSeparator == undefined ? cultures[cultureIndex].ts : thousandSeparator,
    currencySymbol = currencySymbol == undefined ? cultures[cultureIndex].cs : currencySymbol,
    sign = value < 0 ? cultures[cultureIndex].ns : '',
    i = parseInt(value = Math.abs(+value || 0).toFixed(decimalPoints)) + '',
    j = (j = i.length) > 3 ? j % 3 : 0;
    return sign + currencySymbol + (j ? i.substr(0, j) + thousandSeparator : '') + i.substr(j).replace(/(\d{{3}})(?=\d)/g, '$1' + thousandSeparator) + (decimalPoints ? decimalSeparator + Math.abs(value - i).toFixed(decimalPoints).slice(2) : '');
}};