function showNewsletterForm()
{   
    new Ajax.Updater('NewsletterFormDiv', '/newsletter/index/ajax/true', {
    onCreate: function() { $('NewsletterFormDiv').innerHTML = 'Loading...' }
    });
}

function newsletterSignUp()
{
    $email = $F('newsletterEmailField');
    
    new Ajax.Updater('NewsletterFormDiv', '/newsletter/add/ajax/true', {
    parameters: { email: $F('newsletterEmailField') },
    onCreate: function() { $('NewsletterFormDiv').innerHTML = 'Loading...' }
    });
}