谁用过Seam:Javascript与EL表达式传值 SeamJavaScript

<script type="text/javascript" src="seam/resource/remoting/resource/remote.js"></script>
<script type="text/javascript" src="seam/resource/remoting/interface.js?userFace"></script>

<script type="text/javascript">
   alert("====");
   function  ceshi(){
    Seam.Component.getInstance("userFace").showTree(displayReason);
    }
   function displayReason(reason){ alert(reason);}
</script>








第一次使用seam的远程调用，请高手帮忙看下，报的错事Seam未定义