CREATE PROCEDURE jm_check_pswd(
  @u_lgn varchar( 255 ),
  @u_psw varchar( 255 )
) AS
begin
  declare @tmp int
  select @tmp = max(user_id)
  from eUsers
  where (user_login like @u_lgn) 
    and (user_password like @u_psw)
    and (active_to > getdate())
  return @tmp
end

with oCmd
      Set .ActiveConnection = oConn
      'i?iaa?ea ia?iey
      .CommandText = "{? = call jm_check_pswd(?, ?)}"
      .Parameters.Refresh
      .Parameters("@u_lgn") = user_lg
      .Parameters("@u_psw") = user_pw
      .Execute
      user_id = .Parameters("@RETURN_VALUE")
    end with

  $stmt = mssql_init("jm_check_pswd");
   mssql_bind($stmt, "@u_lgn", $this->User_login, SQLVARCHAR,FALSE,FALSE, 255 );
   mssql_bind($stmt, "@u_psw", $this->User_password, SQLVARCHAR,FALSE,FALSE, 255 );
   $res= mssql_execute($stmt);
   echo type($res);
   unset($stmt);  // <---VERY important