// Attach handler to window load event
Event.observe(window, 'load', init, false);

function init() {
 // Attach handler to form's submit event
 Event.observe('addressForm', 'submit', store_address);
}

function store_address(e) {
 // Update user interface
 $('response').innerHTML = '<img src="http://images.solecial.com.s3.amazonaws.com/etc/mini-spinner.gif" align="absmiddle"> Adding email address...';
 
 // Prepare query string and send AJAX request
 var pars = 'email=' + escape($F('emailbox'));
 var myAjax = new Ajax.Updater('response', '/ajax/add_email.php', {method: 'get', parameters: pars});
 
 // Stop form from submitting when JavaScript is enabled
 Event.stop(e);
}