师父旗袍女李博:ASP编程!高手帮我看看呀!

用户登陆的代码:
<%
' *** Validate request to log in to this site.
MM_LoginAction = Request.ServerVariables("URL")
If Request.QueryString<>"" Then MM_LoginAction = MM_LoginAction + "?" + Server.HTMLEncode(Request.QueryString)
MM_valUsername=CStr(Request.Form("txtuserid"))
If MM_valUsername <> "" Then
MM_fldUserAuthorization=""
MM_redirectLoginSuccess="lognsucc.asp"
MM_redirectLoginFailed="userlogon1.asp"
MM_flag="ADODB.Recordset"
set MM_rsUser = Server.CreateObject(MM_flag)
MM_rsUser.ActiveConnection = MM_dbconn_STRING
MM_rsUser.Source = "SELECT UserID, UserPWD"
If MM_fldUserAuthorization <> "" Then MM_rsUser.Source = MM_rsUser.Source & "," & MM_fldUserAuthorization
MM_rsUser.Source = MM_rsUser.Source & " FROM user WHERE UserID='" & Replace(MM_valUsername,"'","''") &"' AND UserPWD='" & Replace(Request.Form("txtuserpwd"),"'","''") & "'"
MM_rsUser.CursorType = 0
MM_rsUser.CursorLocation = 2
MM_rsUser.LockType = 3
MM_rsUser.Open
If Not MM_rsUser.EOF Or Not MM_rsUser.BOF Then
' username and password match - this is a valid user
Session("MM_Username") = MM_valUsername
If (MM_fldUserAuthorization <> "") Then
Session("MM_UserAuthorization") = CStr(MM_rsUser.Fields.Item(MM_fldUserAuthorization).Value)
Else
Session("MM_UserAuthorization") = ""
End If
if CStr(Request.QueryString("accessdenied")) <> "" And false Then
MM_redirectLoginSuccess = Request.QueryString("accessdenied")
End If
MM_rsUser.Close
Response.Redirect(MM_redirectLoginSuccess)
End If
MM_rsUser.Close
Response.Redirect(MM_redirectLoginFailed)
End If
%>

数据库中各字段:
UserID 数字
UserPWD 数字
错误类型：
Microsoft JET Database Engine (0x80040E07)
标准表达式中数据类型不匹配。
/testsite/userlogon.asp, 第 21 行