How to solve Ajax problem in Tomcat server

Question

we are using Tomcat 5.0.27 server and my sql server. we using AJAX Techniques in my projects. but its some times working fine but sometimes not working the code sample is given by
var req;
var names;
function initRequest(url) {
if (window.XMLHttpRequest)
     req = new XMLHttpRequest();
else if (window.ActiveXObject)
isIE = true;
req = new ActiveXObject("Microsoft.XMLHTTP");
if (req==null)
          alert("Your browser does not support XMLHTTP.")
function loadPurchase(startLetter)
     var mon=document.getElementById('month').value;
var yea=document.getElementById('year').value;
var url = "../inventory?actionS=INVPurchase&month="+escape(mon)+"&year="+escape(yea)+"&id="+escape(startLetter);;
     initRequest(url);
     req.onreadystatechange = PurchaseRequest;
     req.open("GET", url, true);
     req.send(null);
function PurchaseRequest() {
          0 (Uninitialized) The object has been created, but not initialized (the open method has not been called).
          1 (Open) The object has been created, but the send method has not been called.
          2 (Sent) The send method has been called, but the status and headers are not yet available.
          3 (Receiving) Some data has been received.
          4 (Loaded) All the data has been received, and is available
alert(re.readyState)
     if(req.readyState == 4)
alert("Inside Ready State");
document.getElementById('Edit').disabled=true;
document.getElementById('Delete').disabled=true;
if (req.status == 200)
PurchaseMessages();
     else
          alert("Problem retrieving XML data")
function PurchaseMessages()
var batchs = req.responseXML.getElementsByTagName("purchases")[0];
var str="";
for(loop = 0; loop < batchs.childNodes.length; loop++)
var batch = batchs.childNodes[loop];
var Refid = batch.getElementsByTagName("Refid")[0];
str = str +Refid .childNodes[0].nodeValue;
var tb=document.getElementById('PurchaseTable');
tb.innerHTML=str ;
the alert coding( req.readyState) is always 1
how to solve for that
please any one help me

Answer 1

Sorry, I've never done this. I went to the Tomcat site and pulled down the CGI docs, which you might have seen:
http://jakarta.apache.org/tomcat/tomcat-5.0-doc/cgi-howto.html
No other help available from me. Sorry.