$ajax Post Issue

I’m doing some Facebook App training and I’m trying to post a comment using a AJAX call which I’ve done a few times however for some reason when I do the call nothing is POSTED?

Anyone help?

$(document).ready(function() {
				$('#comment').click(function() {
					$data = $('#txtcomment').val();
					$.ajax({
						type:'POST',
						url: '/action_comment.php',
						data: $data
					})
				});
			});

http://facebook.rollertestingserver.co.uk/

Resolved.