// General use function

// Validate an email address
function validateEmail(email) {
    if (email == "") {
         return false
    }
    if (email.length < 6) {
        return false;
    }
    if (email.indexOf("@") < 0) {
        return false;
    }
    if (email.indexOf(".") < 0) {
        return false;
    }
    return true;
}

// Format a number as currency
function formatAsCurrency(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);
}