document.getElementById('eNewsletterSubmit').onclick = function () {
    var mailTo = 'serge@sergeconsulting.com';
    var email = document.getElementById('eNewsletterEmail').value;
    var url = 'mailto:' + mailTo + '?subject=E-Newsletter Subscription&body=Email: ' + email;
    window.location.href = url;
    return false;
}