Username checker HELP

Question

FIRST SORRY TO MY ENGLISH :D
my problem it's simple :D
I have a username checker in ajax that work but i have
problem to the dreamweaver insert in the database.
I want than if the username it's already in use, the insert
in the database stopping, and if the username is available the
insert run.
This is the code:
Ajax script in the main page
<script language="javascript">
function OnChangedUsername()
if(document.modifica_dati_utente.username.value == "")
document.modifica_dati_utente.modifica_dati_utente.disabled
= true;
else
document.modifica_dati_utente.modifica_dati_utente.disabled
= false;
function createRequestObject() {
var ro;
var browser = navigator.appName;
if(browser == "Microsoft Internet Explorer"){
ro = new ActiveXObject("Microsoft.XMLHTTP");
}else{
ro = new XMLHttpRequest();
return ro;
var http = createRequestObject();
function sndReq() {
http.open('get',
'ajax_username.asp?username='+document.modifica_dati_utente.username.value+'&id_cliente=' +document.modifica_dati_utente.id_cliente.value);
http.onreadystatechange = handleResponse;
http.send(null);
function handleResponse() {
if(http.readyState == 4){
var response = http.responseText;
var update = new Array();
if(response.indexOf('|' != -1)) {
update = response.split('|');
document.getElementById("username_chk").innerHTML =
update[0];
</script>
ASP PAGE WITH RECORDSET
<%@LANGUAGE="VBSCRIPT"%>
<!--#include virtual="/XXXXXXXXXXXXXXXXXXX" -->
<%
Set username = Request.QueryString("username")
Set id_cliente = Request.QueryString("id_cliente")
%>
<%
if Request.QueryString("username") <> "" then
%>
<%
Dim chk_username
Dim chk_username_cmd
Dim chk_username_numRows
Set chk_username_cmd = Server.CreateObject ("ADODB.Command")
chk_username_cmd.ActiveConnection = MM_XXXXXX_STRING
chk_username_cmd.CommandText = "SELECT * FROM dbo.XXXXXXX
WHERE username = '"& username &"' AND id_cliente <>
'"& id_cliente &"'"
chk_username_cmd.Prepared = true
Set chk_username = chk_username_cmd.Execute
chk_username_numRows = 0
If chk_username.EOF = False then
response.write "<strong><font
color=""#990000"">L'USERNAME E' GIA IN
USO</font></strong>"
Else
response.write "<strong><font
color=""#009900"">USERNAME NON IN
USO</font></strong>"
End if
%>
<%
chk_username.Close()
Set chk_username = Nothing
%>
<%else%>
<% response.write ""%>
<%end if%>
The insert in the Database use the classic dreamweaver code.
To call the script use: onblur="sndReq()" in the textfield
IMPORTANT: I use the spry to validate other textfiled in the
form
Thank a lot

Answer 1

I may be missing something here, but why in the world do you need to write out a username/password, then just go ahead and read it right back again?