// Currency conversion functions
var currency = '\$';
var currency_precision = 2;

// String to cents
String.prototype.toCents = function () {
    cents = parseInt(this.replace(/\D/g, ""));
    if (isNaN(cents)) cents = 0;
    periodPos = this.length - this.indexOf(".") - 1
    if (this.indexOf(".") < 0) cents *= 100;
    else if (periodPos < 2) cents *= 10;
    if (this.indexOf("-") != -1) cents = -cents;
    return cents;
};
// String to currency (delegates to Number)
String.prototype.currency = function () {
    return parseInt(this).currency();
};
// Number to currency format
Number.prototype.currency = function () {
    return this.toMoney(currency, currency_precision);
}
// Jquery shortcut
$.fn.currency = function (amount) {
    $(this).each(function () {
        currencyAmount = new Number(amount / 100);
        $(this).text(currencyAmount.toMoney(currency, currency_precision));
    });
    return $(this);
};

/**
 Money formatting
 */
Number.prototype.toMoney = function (currency, decimals, decimal_sep, thousands_sep) {
    var n = this,
        c = isNaN(decimals) ? 2 : Math.abs(decimals), //if decimal is zero we must take it, it means user does not want to show any decimal
        d = decimal_sep || '.', //if no decimal separator is passed we use the dot as default decimal separator (we MUST use a decimal separator)

        /*
        according to [http://stackoverflow.com/questions/411352/how-best-to-determine-if-an-argument-is-not-sent-to-the-javascript-function]
        the fastest way to check for not defined parameter is to use typeof value === 'undefined'
        rather than doing value === undefined.
        */
        t = (typeof thousands_sep === 'undefined') ? ',' : thousands_sep, //if you don't want to use a thousands separator you can pass empty string as thousands_sep value

        sign = (n < 0) ? '-' : '',

        //extracting the absolute value of the integer part of the number and converting to string
        i = parseInt(n = Math.abs(n).toFixed(c)) + '',

        j = ((j = i.length) > 3) ? j % 3 : 0;
    return sign + currency + (j ? i.substr(0, j) + t : '') + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : '');
}
Number.prototype.centsToMoney = function (currency, decimals, decimal_sep, thousands_sep) {
    return (this / 100).toMoney(currency, decimals, decimal_sep, thousands_sep)
}