我看登陆漏洞的教程看不懂，所以请高人看看我的源码，应该怎么改才能去除漏洞，以下是我的登陆源码:
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<%@LANGUAGE="VBSCRIPT"%>

<%
set Recordset1 = Server.CreateObject("ADODB.Recordset")
Recordset1.ActiveConnection = MM_www_STRING
Recordset1.Source = "SELECT * FROM data"
Recordset1.CursorType = 0
Recordset1.CursorLocation = 2
Recordset1.LockType = 3
Recordset1.Open()
Recordset1_numRows = 0
%>
<%
' *** Validate request to log in to this site.
MM_LoginAction = Request.ServerVariables("URL")
If Request.QueryString<>"" Then MM_LoginAction = MM_LoginAction + "?" + Request.QueryString
MM_valUsername=CStr(Request.Form("textfield"))
If MM_valUsername <> "" Then
MM_fldUserAuthorization=""
MM_redirectLoginSuccess="hj1681.asp"
MM_redirectLoginFailed="err.asp"
MM_flag="ADODB.Recordset"
set MM_rsUser = Server.CreateObject(MM_flag)
MM_rsUser.ActiveConnection = MM_www_STRING
MM_rsUser.Source = "SELECT admin, password"
If MM_fldUserAuthorization <> "" Then MM_rsUser.Source = MM_rsUser.Source & "," & MM_fldUserAuthorization
MM_rsUser.Source = MM_rsUser.Source & " FROM pass WHERE admin='" & MM_valUsername &"' AND password='" & CStr(Request.Form("textfield2")) & "'"
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 true 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
%>

管理员登陆页

（如果你不是管理员，请离开，否则后果自负）

用户名：

密　码：

<%
Recordset1.Close()
%>
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谢谢！！！！！！！！！

错了，应当是这样，将USER改成admin

MM_rsUser.Source = MM_rsUser.Source & " FROM menber WHERE admin='" & Replace(MM_valUsername,"'","''") &"' AND password='" & Replace(Request.Form("password"),"'","''") & "'"