this is a limitation to ASP when uploading a file, the generic request collection is used by the recordset.
change the fdollowing code:
If (Request("MM_EmptyValue") <> "") Then
rs_edit__MMColParam = Request("MM_EmptyValue")
to:
If (Request.QueryString("MM_EmptyValue") <> "") Then
rs_edit__MMColParam = Request.QueryString("MM_EmptyValue")