function signup(){
	
	var email_address = $('mailing_email').value;
	
	new Ajax.Updater('signup_form_message', base_url+'mailinglist/signup', {
					parameters: 'email_address='+email_address,
					onLoading: function() { 
							display_loader( 'signup_form_message','' );
						}
				} );
}