Event.observe(window, 'load', init, false);

function init(){
	$('greeting-submit').style.display = 'none';
	Event.observe('greeting-name', 'keyup', greet, false);
}

function greet(){
	var url = 'greeting.php';
	var pars = 'greeting-name='+escape($F('greeting-name'));
	var target = 'greeting';
	var myAjax = new Ajax.Updater(target, url, {	method: 'get',	parameters: pars});
}