Format Number & Currency

    var CURRENCY_US = "$";
    var CURRENCY_EURO = "€";

    function testFormatNumbers() {
        var number = formatNumber(1234.56)
        var defcurr = formatCurrency(1234.56)
        var eurocurr = formatCurrency(1234.56, CURRENCY_EURO)

        alert(number + "\n" + defcurr + "\n" + eurocurr);

    }
    function formatNumber(num) {
        return _formatCurrency(num);
    }

    function formatCurrency(num, currencySign) {
        currencySign = currencySign || "$";
        return _formatCurrency(num, currencySign);
    }

    function _formatCurrency(num, currencySign) {

        currencySign = currencySign || "";

        if(currencySign !== "")
            currencySign = currencySign + " ";

        num = num.toString().replace(/\$|\,/g, '');
        if (isNaN(num))
            num = "0";

        sign = (num == (num = Math.abs(num)));
        num = Math.floor(num * 100 + 0.50000000001);
        cents = num % 100;
        num = Math.floor(num / 100).toString();

        if (cents < 10)
            cents = "";
        if (cents !== "")
            cents = "." + cents;

        for (var i = 0; i < Math.floor((num.length - (1 + i)) / 3); i++)
            num = num.substring(0, num.length - (4 * i + 3)) + ',' +

        num.substring(num.length - (4 * i + 3));

        return (((sign) ? '' : '(') + currencySign + "" + num + cents + ((sign) ? '' : ')'));
    }