DWR - Not returning search results

Hi Ranchers,

Recently, I have been assigned to a new project that requires knowledge of DWR/AJAX. AJAX is something I've never worked on. So to get started with things, I am working on this small application to get a feel of how DWR works. Basically, I've created an input form that stores user details (firstname, lastname email etc.) in an object. I then create a serach form to search for and display the data using the first name.
However, I see that the search results are not populated at all.. Here's the code fragments .Would really appreciate any pointers

Web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	id="WebApp_ID" version="2.5">
	
	<display-name>ContactsSample</display-name>
	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
		<welcome-file>default.jsp</welcome-file>
	</welcome-file-list>

<servlet>
        <servlet-name>dwr-invoker</servlet-name>
        <servlet-class>uk.ltd.getahead.dwr.DWRServlet</servlet-class>
        <init-param>
            <param-name>debug</param-name>
            <param-value>true</param-value>
        </init-param>
    </servlet>

<servlet-mapping>
        <servlet-name>dwr-invoker</servlet-name>
        <url-pattern>/dwr/*</url-pattern>
    </servlet-mapping>	
	
	<servlet>
		<servlet-name>spring</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>spring</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>
	
</web-app>

DWR.xml

Here's the page that displays search results;

<%@taglib uri="http://www.springframework.org/tags" prefix="spring"%>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<html>
<head>
<script src='dwr/interface/ContactDAO.js'></script>
  <script src='dwr/engine.js'></script>
  <script src='dwr/util.js'></script>
  <script>
  function updateResults() {
	    var firstname = document.getElementById("filter").value;
	  alert(firstname);
	    ContactDAO.findContact(filltable,firstname);
	    alert('after DAO');
	    $("resultTable").style.display = '';
	    alert('after En');
	}

function fillTable(contact) {
	    dwr.util.addRows("peoplebody", contact, [ getFirstname, getLastname, getEmail, getTelephone]);
	}
  </script>
	<title>Spring 3 MVC Series - Contact Manager</title>

</head>
<body>

<h2>Contact Manager</h2>

----

-----
---

<p>Search: <input id="filter" onkeyup="updateResults();"/></p>
<div id="resultTable">
<table border="1" class="rowed grey">
   <thead>
     <tr>
       <th>First Name</th>
        <th>Last Name</th>
       <th>email</th>
       <th>telephone</th>
     </tr>
   </thead>
   <tbody id="peoplebody">
   </tbody>
 </table>
<div id="resultTable">
</body>
</html>

Here is the findContact Method:

ok..Here's an update.The callback method in contact,jsp was being called with an incorrect name..

ContactDAO.findContact(filltable,firstname);
instead of

ContactDAO.findContact(fillTable,firstname);

I have alert statements after each line in the method..The call to 'ContactDAO.findContact(fillTable,firstname);' alerts with 'Error'. Also, running the program in debug mode, does not take the control to the findContact() method.So I am assuming that the method is not called at all...

Would appreciate any inputs..