-------------------------jiance5-1.asp---------------------------
<script language="javascript">
    if(typeof(XMLHttpRequest)=="undefined" && window.ActiveXObject)
    {
        function XMLHttpRequest()
        {
            var xmlhttp_arr=["MSXML2.XMLHTTP","Microsoft.XMLHttp"];
            var xml_request;
            for(var i=0;i<xmlhttp_arr.length;i++)
            {
                if(xml_request=new ActiveXObject(xmlhttp_arr[i]))
                break;
            }
            return xml_request;
        }
    }
var xml_http_request=new XMLHttpRequest();

function check_news()
{
    xml_http_request.open("GET","jiance5-2.asp",true);
    xml_http_request.onreadystatechange=newwin;
    xml_http_request.send(null);
    setTimeout("check_name()",1000);
}
function newwin()    
{
    if(xml_http_request.readyState==4)
    {
        if(xml_http_request.status==200)
        {
            var res=xml_http_request.responseText;
            if(res=="test")
            {
                var popup =createPopup();
                var winstr ="您有新消息";
                var opopup = popup.document.body;
                 opopup.style.background="lightyellow";
                 opopup.style.border="solid blue 1px";
                 opopup.innerHTML=winstr;
                 popup.show(100,100,1000,100 ,(document.body));

                }
            }
        }
    }
</script>
</head>
<body onload="check_news()">
</body>

---------------------------jiance5-2.asp----------------------------
<!--#include file="conn.asp"-->
<%
    Dim oRs,sSql
    Set oRs=Server.CreateObject("ADODB.RecordSet")
    sSql="select * from tbMessage where readflag=0"  //readflag=0 表示消息未读
    oRs.open sSql,objConn,1,1
    if NOT(oRs.eof and oRs.bof) then
        response.Write("test")
    end if
    oRs.close
    set oRs=nothing
    objConn.close
    set objConn=nothing
%>

----------------------------------------------------------------------
以上代码我想实现及时监测论坛消息，如果有未读的消息就会弹出一个Popup窗口提示有未读的消息，现在的问题是当我将消息都设置为 已读（readflag=1）后，还是不停的提示有新消息，请问这是怎么回事啊