function valNewsLetter() {
    em = document.getElementById('field_3796').value;
    if (em == '' || em == 'E-mail') {
        alert('Enter E-mail please.');
        return false;
    }
    
    if (!em.match(/^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/)) {
        alert('E-mail is invalid.');
        return false;
    }
    
    alert('Thank you. Please look in your inbox and verify your subscription.');
    return true;
}