function newsletter_init() {
	if ($('newsletter-form')) Event.observe('subscribe', 'click', submit_newsletter_form)
}

function submit_newsletter_form() {
	fields = Form.serialize($('newsletter-form'))
	Form.disable('newsletter-form')
	new Ajax.Request('newsletter.php', {method:'post', postBody:fields})
	return false
}
Event.observe(window, 'load', newsletter_init )