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var formatInt = function (num) {
    num = parseFloat(num);
    return num.toLocaleString('de-DE', {minimumFractionDigits: 2});
};

// SOURCE: http://blog.tompawlak.org/number-currency-formatting-javascript

function formatNumber (num) {
    return num.toString().replace(/(\d)(?=(\d{3})+(?!\d))/g, "$1,");
}

console.info(formatNumber(2665));      // 2,665
console.info(formatNumber(102665));    // 102,665
console.info(formatNumber(111102665)); // 111,102,665
console.info(formatNumber(1240.5));    // 1,240.5
console.info(formatNumber(1000240.5)); // 1,000,240.5


function currencyFormat (num) {
    return "$" + num.toFixed(2).replace(/(\d)(?=(\d{3})+(?!\d))/g, "$1,");
}

console.info(currencyFormat(2665));   // $2,665.00
console.info(currencyFormat(102665)); // $102,665.00


function currencyFormatDE (num) {
    return num
       .toFixed(2)                                        // always two decimal digits
       .replace(".", ",")                                 // replace decimal point character with ,
       .replace(/(\d)(?=(\d{3})+(?!\d))/g, "$1.") + " €"; // use . as a separator
}

console.info(currencyFormatDE(1234567.89)); // output 1.234.567,89 €