Form validation using jsp and AJAX

I am trying to validate a form using ajax.My code (which i am putting below) works for email id validation however i am not able to get it work for confirming password.Please help.Heres the code

reginfo.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
<link rel="stylesheet" type="text/css" href="template1.css">
</head>
<script type="text/javascript">
function xmlhttpPost(strURL)
{
var xmlHttpReq = false;
var self = this;

// Mozilla/Safari
if (window.XMLHttpRequest)
{
self.xmlHttpReq = new XMLHttpRequest();
}
// IE
else if (window.ActiveXObject)
{
self.xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
}
self.xmlHttpReq.open('POST', strURL, true);
self.xmlHttpReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
self.xmlHttpReq.onreadystatechange = function()
{
if (self.xmlHttpReq.readyState == 4)
{
updatepage(self.xmlHttpReq.responseText);
}
}

self.xmlHttpReq.send(getquerystring());

}

function getquerystring()
{
var word = document.getElementById("email_id").value;
var word1 = document.getElementById("password").value;
var word2 = document.getElementById("confirm_password").value;
alert(word);
alert(word1);
alert(word2);
word = 'w='+ escape(word);
word1 = 'w1='+ escape(word1);
word2 = 'w2='+ escape(word2); // NOTE: no '?' before querystring
return word;
return word1;
return word2;
}

function updatepage(str)
{
document.getElementById("result").innerHTML = str;
document.getElementById("password_result").innerHTML = str;
}

</script>
<body>

<div class="header">
<div class="top_info">

</div>
<div class="logo">

<h1><a href="#" title="Centralized Internet Services"><span class="dark">SITE</span>
LOGO</a></h1>
</div>
</div>
<div class="bar">
<ul>
<li class="browse_category">Welcome to SITE NAME</li>

</ul>
</div>
<div class="reg_center">
<h3>REGISTRATION</h3><br/>
<form name="reg" method="post" >
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="10" FRAME="box">
<TR>
<TD><font face="Chiller" size="5"><b>First Name:</b> <input type="text" size="35" name="first_name"></font></TD>

<TD><font face="Chiller" size="5"> <b>LastName:</b> <input type="text" size="35" name="last_name"></font></TD>

</TR>
<tr></tr>
<TR>
<TD><font face="Chiller" size="5"><b>Gender:</b></font> <input type="radio" size="35" name="gender">Male
<font face="Chiller" size="5"><input type="radio" size="35" name="gender">Female </font>
</TR>
<TR>
<TD><font face="Chiller" size="5"><b>BirthDate:</b> <input type="text" size="35" name="date_of_birth"></font></TD>
</TR>

<TR><TD><font face="Chiller" size="5"><b> (mm/dd/yyyy)</b></font></TD></TR>

<TR>
<TD><font face="Chiller" size="5"><b>Email id:</b> <input type="text" size="34" name="email_id" id="email_id"><div id="result"></TD>
</TR>

<TR>
<TD><font face="Chiller" size="5"><b>Password:</b> <input type="password" size="34" name="password" id="password"><div id="password_result"></TD>
<TD><font face="Chiller" size="5"><b>Confirm Password:</b><input type="password" size="35" name="confirm_password" id="confirm_password"></TD>
</TR>
<tr></tr>
<tr>
<td colspan="2">
<font face="Chiller" size="5"><center><input type="button" value="Register" onclick='JavaScript:xmlhttpPost("regajax.jsp")'></center>
</td>
</tr>
</table>

</form>

</div>

<div class="footer">

</div>
</div>

</body>
</html>

regajax.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
<style type="text/css">
#header{
color:red;

}
</style>
</head>
<body>
<%
String w = request.getParameter("w");
String w1 = request.getParameter("w1");
String w2 = request.getParameter("w2");

String msg =w;
String ter="Invalid email id";
String ter1="Password don't match";
%>
<%=w1%>
<%=w2%>
<%
int atpos=w.indexOf("@");
int dotpos=w.lastIndexOf(".");
if (atpos<1 || dotpos<atpos+2 || dotpos+2>=w.length())
{%>
<%=ter%>
<%
}
if (w1!=w2)
{%>
<%=ter1%>
<%
} %>

</body>
</html>

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I would have gone ahead and added the code tags for you, but the code is unindented, so it would not help much. Please re-post the code using code tags and proper indentation.