Problem of using ajax with jseam remoting

[zzuli]

Hi,everyone:
    I'm, studying ajax in jseam with remoting, but got stuck with a little demo.
     The java code:
@Local
public interface HelloLocal {
  @WebRemote
  public String sayHello(String name);
}

@Stateless
@Name(helloAction)
public class HelloAction implements HelloLocal {
  public String sayHello(String name) {
    return  name;
  }
}

     The xhtml page:
  <script type="text/javascript"
                        src="seam/resource/remoting/resource/remote.js"></script>
                <s:remote include="helloAction" />

                <script type="text/javascript">
   
        function sayHello() {
          var name = 'zwz';
          Seam.Component.getInstance("helloAction").sayHello(name, sayHelloCallback);
        }
       
        function sayHelloCallback(result) {
          alert(result);
        }
                </script>

                <button onclick="javascript:sayHello()">
                        Say Hello
                </button>

    But when deployed and ran, it always warn javascript error "Seam method not defined", and there's no exception.
    In fact the demo is copy from jseam examples.
    I use jseam2.1.1 , JBoss AS 5.0 , ie7.
    Could anyone help me?
    Or if anyone has some runnable simple demo, could please send me a copy? [e-mail]
    Thanks very much.