//Format decimal to currency
// http://javascript.internet.com/forms/currency-format.html
function formatCurrency(num) {

    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 = "0" + 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) ? '' : '-') + '$' + num + '.' + cents);
}

//String Buffer to make building strings faster
//http://www.softwaresecretweapons.com/jspwiki/javascriptstringconcatenation
function StringBuffer() {
    this.buffer = [];
}

StringBuffer.prototype.append = function append(string) {
    this.buffer.push(string);
    return this;
};

StringBuffer.prototype.toString = function toString() {
    return this.buffer.join("");
};

//Check if value is numeric
function isNumeric(input) {
    return typeof (input) == 'number';
}