function addSubscriber(form) {
    form.submit.value    = 'Wait...';
    form.submit.disabled = true;
    if (form.email.value) {
        ajax.script = 'subscriber.add';
        var id = ajax.load('email', form.email.value);
        if (id) {
            //alert(id);
            alert('The email "' + form.email.value + '" was added to our database of subscribers. Thank you.');
        } else {
            alert('Your email is not valid. Please, try again.');
            form.email.focus();
            form.email.select();
        }
    } else {
        alert('You need to suply a valid email. Please, try again.');
        form.email.focus();
    }
    form.submit.disabled = false;
    form.submit.value    = 'Subscribe';
}