Response is blank (Not Return ing)

Hello
I have facing the problem in mozila (2.0.0.4)

I have calling ajax for  login process..

Here i ma not able to get ready state=3 , all othere state are
comeing..

Here response is null.

Below is sample of xml data

 <?xml version="1.0" encoding="iso-8859-1" ?>
- <list_data>
  <usertype>Expert</usertype>
  <publicflag>0</publicflag>
  <memberid>42</memberid>
  <automaticlogin>0</automaticlogin>
  <mode>Expert</mode>
  <emailcheck>0</emailcheck>
  <emailaddress>[email protected]</emailaddress>
  <password>hidden</password>
  <recordcount>1</recordcount>
  </list_data>

This is how i am calling response function

if(window.XMLHttpRequest)
		{
			http_response=new XMLHttpRequest();
		  	http_response.open("GET",url,true);
			http_response.onreadystatechange=handleHttpResponse_validatex;
			http_response.send(null);
		}
		else if (window.ActiveXObject)
		{
			http_validatex1=new ActiveXObject("Microsoft.XMLHTTP")
			if (http_response)
			{
				http_response.open("GET",url,true);
				http_response.onreadystatechange=handleHttpResponse_validatex;
				http_response.send();
			}
		}