application.html.erb

<form id="login-window" action="/session" method="post" title="Sign in with your username and password">
		Login: <input id="login" name="login" type="text" /><br />
		Password: <input id="password" name="password" type="password" />
	</form>
	<script type="text/javascript">
	$(document).ready(function() {
		$('#login-window').dialog({
			autoOpen: false,
			resizable: true,
			draggable: false,
			modal: true,
			buttons: {
				"Log In": function() {
					$.post('/sessions', $('#login-form').serialize(), function() {
						$(this).dialog('close');
						location.reload();				// refresh page
					});
				},
				"Cancel": function() {
					$(this).dialog('close');
				},
				"Register": function() {
					window.location = '/signup';
					$(this).dialog('close');
				}
			},
		});
	});
	</script>