<script type="text/javascript">	
 $('start').addEvent('click', function(e) {
	e = new Event(e).stop();
 
	var url = "http://www.yandex.ru/";
 
	new Ajax(url, {
		method: 'get',
		update: $('log')
	}).request();
});   
    
 </script> 
<p><a id="start" href="#">Click here</a> to start Ajax request</p>
<div id="log">
	<p>Waiting...</p>
</div>