Tree struts 2

Front-end
#1 
<?xml version="1.0" encoding="ISO-8859-1" ?>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <s:head theme="ajax" />
  <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
  <script language="javascript">
    
      var botao = {
        
                      clicar : function() {
                         
                          alert("Clicou no registro : ");
                         
                      }
      
      };

</script>
    
</head>
<body>

   <s:url id="index" action="Tree"></s:url>
   
   <div align="left" id="t">
      
     <s:tree label="Help Desk" id="parentId" theme="ajax">
 
        <s:treenode label="Técnico" theme="ajax">
           <s:treenode label="Cadastrar Técnico" id="%{index}" onclick="botao.clicar();" theme="ajax"> 
           </s:treenode>
        </s:treenode>    
        
        
     </s:tree>
      
   </div>
   
</body> 
</html>

Gente como eu faço para chamar essa função javascript ? Ao clicar no treenode Cadastro Técnico nao chama a função javascript !!!

#2

UP :shock:

#3