Anyone into mootools?

Can anyone help with this function which brakes on the first chain:

    		window.addEvent('domready', function(){
			$('start').addEvent('click', function(e) {
				e = new Event(e).stop();
			
				var url = "http://localhost/seo/index.php/index/custom_1";
				new Ajax(url, {
					method: 'get',
					update: $('log')
				}).request()
				
				.chain(function(){
					url = "http://localhost/seo/index.php/index/custom_2";
					update: $('log')
					this.request();
				})
				
				.chain(function(){
					url = "http://localhost/seo/index.php/index/custom_3";
					update: $('log')
					this.request();
				});
			});
		});

Code (markup):

 

Are you testing this out on localhost ajax wont work like that you need to use a domain with a tld.