简单的不能再简单的AJAX原型调了1天了，还是只执行一次回调，请帮忙解决！该怎么处理

简单的不能再简单的AJAX原型调了1天了，还是只执行一次回调，请帮忙解决！
test.asp
<script>
var xmlHttpWL = false;
try {
xmlHttpWL = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
xmlHttpWL = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e2) {
xmlHttpWL = false;
}
}
if (!xmlHttpWL && typeof XMLHttpRequest != 'undefined') {
xmlHttpWL = new XMLHttpRequest();
}
var xmlHttpWL01 = false;
try {
xmlHttpWL01 = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
xmlHttpWL01 = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e2) {
xmlHttpWL01 = false;
}
}
if (xmlHttpWL01 && typeof XMLHttpRequest != 'undefined') {
xmlHttpWL01 = new XMLHttpRequest();
}

function add()
{
url = "Test_duibi.asp?action=setstr&pname="+document.getElementsByName("pname")[0].value;
xmlHttpWL.open("GET", url, true);
xmlHttpWL.send(null);
}
function get()
{
url = "Test_duibi.asp";
xmlHttpWL01.onreadystatechange = setTable;
xmlHttpWL01.open("GET", url+"?t="+Math.random(), true);
xmlHttpWL01.send(null);
}

function setTable()
{

if (xmlHttpWL01.readyState == 4)
{
if (xmlHttpWL01.status == 200)
{
var ss = xmlHttpWL01.responseText;
alert(ss);
}
}
}
</script>
<INPUT TYPE="text" NAME="pname" > <INPUT TYPE="button" value="set" onclick="add();"> <INPUT TYPE="button" value="get" onclick="get();">
<%
response.write("Cookies="&Request.Cookies("WL_DuiBi"))
%>
================================
Test_duibi.asp
====================
<%@ LANGUAGE = VBScript codepage=65001%>
<%
response.charset="utf-8"
Response.Buffer = True
response.expires=0
Response.CacheControl="no-cache "
Response.AddHeader "Pragma","no-cache"

Select Case request("action")
Case "setstr" : setstr()
Case Else
getstr()
End Select
Sub setstr()
response.cookies("WL_DuiBi")=Trim(request("pname"))
End Sub

Sub getstr()
response.write(Request.Cookies("WL_DuiBi"))
End Sub
%>

=======================
所有功能实现都没有问题，就是只回调一次，即使不用COOKICES，换成返回随机数或数据库内容也只回调一次，
还试过一个 xmlHttpWL01.abort(); 的也不行，缓存也清了，url也加了随即参数，但还是不行，请教？

------解决方案--------------------
其实你可以写成

JScript code


function cXML(){
    var objXML=null,xmlStr
    if(window.ActiveXObject){
        var xmlStr=new Array(
        "Msxml2.XMLHTTP.5.0",
        "Msxml2.XMLHTTP.5.0",
        "Msxml2.XMLHTTP.4.0",
        "Msxml2.XMLHTTP.3.0",
        "Msxml2.XMLHTTP",
        "Microsoft.XMLHTTP");
        for(var i=0;i<xmlStr.length;i++){
            try{
                var objXML=new ActiveXObject(xmlStr[i]);
                return objXML;
            }catch(e){}
        }
    }
    else if(window.XMLHttpRequest){
        var objXML=new window.XMLHttpRequest()
        return objXML;
    }
}

function add(){ 
    url = "Test_duibi.asp?action=setstr&pname="+document.getElementsByName("pname")[0].value; 
    xmlHttpWL=cXML()
    xmlHttpWL.open("GET",url); 
    xmlHttpWL.onreadystatechange = setTable; 
    xmlHttpWL.send(null); 
} 
function get(){
    url = "Test_duibi.asp"; 
    xmlHttpWL=cXML()
    xmlHttpWL01.open("GET",url); 
    xmlHttpWL01.onreadystatechange = setTable; 
    xmlHttpWL01.send(null); 
} 

function setTable(){ 
    if(xmlHttpWL01.readyState != 4)return false;
    if(xmlHttpWL01.status != 200)return false;
    var ss = xmlHttpWL01.responseText; 
    alert(ss); 
}

简单的不能再简单的AJAX原型调了1天了，还是只执行一次回调，请帮忙解决！该怎么处理

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