alla fine ci sono riuscito!!!

questa e' la stringa corretta:

codice:
sql="update accessi set online = 'si' WHERE utenti ='" & Session("MM_username")&"'"


bene, ora pero' lo stavo testando nel tasto di log-out per mettere il valore a no.
Pero' mi da' un problema sulla stringa di connessione al db e come
errore mi restituisce:

codice:
Tipo di errore:
Errore di run-time di Microsoft VBScript (0x800A01A8)
Necessario oggetto:
sto impazzendo l'oggetto comunque e' dichiarato nella pagina in fondo!

vi posto il codice e vi segnalo in rosso i riferimenti:

codice:

<%
' *** Logout the current user.
MM_Logout = CStr(Request.ServerVariables("URL")) & "?MM_Logoutnow=1"
sql="update accessi set online = 'no' WHERE utenti ='" & Session("MM_username")&"'" 
MM_editCmd.ActiveConnection.execute(sql)
If (CStr(Request("MM_Logoutnow")) = "1") Then
  Session.Contents.Remove("MM_Username")
  Session.Contents.Remove("MM_UserAuthorization")
  MM_logoutRedirectPage = "default.asp"
  ' redirect with URL parameters (remove the "MM_Logoutnow" query param).
  if (MM_logoutRedirectPage = "") Then MM_logoutRedirectPage = CStr(Request.ServerVariables("URL"))
  If (InStr(1, UC_redirectPage, "?", vbTextCompare) = 0 And Request.QueryString <> "") Then
    MM_newQS = "?"
    For Each Item In Request.QueryString
      If (Item <> "MM_Logoutnow") Then
        If (Len(MM_newQS) > 1) Then MM_newQS = MM_newQS & "&"
        MM_newQS = MM_newQS & Item & "=" & Server.URLencode(Request.QueryString(Item))
      End If
    Next
    if (Len(MM_newQS) > 1) Then MM_logoutRedirectPage = MM_logoutRedirectPage & MM_newQS
  End If
  Response.Redirect(MM_logoutRedirectPage)
End If
%>
<%
' *** Edit Operations: declare variables

Dim MM_editAction
Dim MM_abortEdit
Dim MM_editQuery
Dim MM_editCmd

Dim MM_editConnection
Dim MM_editTable
Dim MM_editRedirectUrl
Dim MM_editColumn
Dim MM_recordId

Dim MM_fieldsStr
Dim MM_columnsStr
Dim MM_fields
Dim MM_columns
Dim MM_typeArray
Dim MM_formVal
Dim MM_delim
Dim MM_altVal
Dim MM_emptyVal
Dim MM_i

MM_editAction = CStr(Request.ServerVariables("SCRIPT_NAME"))
If (Request.QueryString <> "") Then
  MM_editAction = MM_editAction & "?" & Request.QueryString
End If

' boolean to abort record edit
MM_abortEdit = false

' query string to execute
MM_editQuery = ""
%>
<%
' *** Update Record: set variables

If (CStr(Request("MM_update")) = "form1" And CStr(Request("MM_recordId")) <> "") Then

  MM_editConnection = MM_connarchivioweb_STRING
  MM_editTable = "archivio"
  MM_editColumn = "id_img"
  MM_recordId = "" + Request.Form("MM_recordId") + ""
  MM_editRedirectUrl = "vedischede.asp"
  MM_fieldsStr  = "autore|value|opera|value|secolo|value|data|value|luogo|value|abstract|value|cliente|value|esecuzione|value|contenitore|value|formato|value|tipo|value|pubblicazione|value|completata|value|approvazione|value|online|value|utente|value"
  MM_columnsStr = "autore|',none,''|opera|',none,''|secolo|',none,''|data|',none,''|luogo|',none,''|abstract|',none,''|cliente|',none,''|esecuzione|',none,''|contenitore|',none,''|formato|',none,''|tipo|',none,''|pubblicazione|',none,''|completata|',none,''|approvazione|',none,''|online|',none,''|utente|',none,''"

  ' create the MM_fields and MM_columns arrays
  MM_fields = Split(MM_fieldsStr, "|")
  MM_columns = Split(MM_columnsStr, "|")
  
  ' set the form values
  For MM_i = LBound(MM_fields) To UBound(MM_fields) Step 2
    MM_fields(MM_i+1) = CStr(Request.Form(MM_fields(MM_i)))
  Next

  ' append the query string to the redirect URL
  If (MM_editRedirectUrl <> "" And Request.QueryString <> "") Then
    If (InStr(1, MM_editRedirectUrl, "?", vbTextCompare) = 0 And Request.QueryString <> "") Then
      MM_editRedirectUrl = MM_editRedirectUrl & "?" & Request.QueryString
    Else
      MM_editRedirectUrl = MM_editRedirectUrl & "&" & Request.QueryString
    End If
  End If

End If
%>
<%
' *** Update Record: construct a sql update statement and execute it

If (CStr(Request("MM_update")) <> "" And CStr(Request("MM_recordId")) <> "") Then

  ' create the sql update statement
  MM_editQuery = "update " & MM_editTable & " set "
  For MM_i = LBound(MM_fields) To UBound(MM_fields) Step 2
    MM_formVal = MM_fields(MM_i+1)
    MM_typeArray = Split(MM_columns(MM_i+1),",")
    MM_delim = MM_typeArray(0)
    If (MM_delim = "none") Then MM_delim = ""
    MM_altVal = MM_typeArray(1)
    If (MM_altVal = "none") Then MM_altVal = ""
    MM_emptyVal = MM_typeArray(2)
    If (MM_emptyVal = "none") Then MM_emptyVal = ""
    If (MM_formVal = "") Then
      MM_formVal = MM_emptyVal
    Else
      If (MM_altVal <> "") Then
        MM_formVal = MM_altVal
      ElseIf (MM_delim = "'") Then  ' escape quotes
        MM_formVal = "'" & Replace(MM_formVal,"'","''") & "'"
      Else
        MM_formVal = MM_delim + MM_formVal + MM_delim
      End If
    End If
    If (MM_i <> LBound(MM_fields)) Then
      MM_editQuery = MM_editQuery & ","
    End If
    MM_editQuery = MM_editQuery & MM_columns(MM_i) & " = " & MM_formVal
  Next
  MM_editQuery = MM_editQuery & " where " & MM_editColumn & " = " & MM_recordId

  If (Not MM_abortEdit) Then
    ' execute the update
    Set MM_editCmd = Server.CreateObject("ADODB.Command")
    MM_editCmd.ActiveConnection = MM_editConnection 
    MM_editCmd.CommandText = MM_editQuery
    MM_editCmd.Execute
    MM_editCmd.ActiveConnection.Close

    If (MM_editRedirectUrl <> "") Then
      Response.Redirect(MM_editRedirectUrl)
    End If
  End If

End If
%>
mi sapete dir qualcosa?