function validateEmail(email) {
    var retVal = false;
    var re = new RegExp('^[_a-zA-Z0-9-]+(\.[_a-zA-Z0-9-]+)*@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)*\.(([0-9]{1,3})|([a-zA-Z]{2,3})|(aero|coop|info|museum|name))$');

    if (typeof (email) != 'undefined' && email != '' && email.match(re)) {
        retVal = true;
    }

    return retVal;
}

function validateRequiredTextField(value) {
    var retVal = false;
    if (typeof (value) != 'undefined' && value != '') {
        retVal = true;
    }

    return retVal;
}

// check if text area reach max length
function limitText(limitField, limitNum) {
    if (limitField.value.length > limitNum) {
        limitField.value = limitField.value.substring(0, limitNum);
    }
}