// 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', storeAddress); 
}

function storeAddress(e) { 
 // Update user interface 
 $('response').innerHTML = 'Adding email address...'; 
 // Prepare query string and send AJAX request 
 var pars = 'address=' + escape($F('address')); 
 var myAjax = new Ajax.Updater('response', 'addEmail.php', {method: 'get', parameters: pars}); 
 // Stop form from submitting when JavaScript is enabled 
 Event.stop(e); 
}