function _cm_initialise ($where)
    // perform any initialisation for the current task.
    {
        // this may be called from the home page, so insert user's id
        if (empty($where)) {
            $pattern_id = getPatternId();
            if (eregi('upd1|enq1', $pattern_id)) {
            	$where = "user_id='" .$_SESSION['logon_user_id'] ."'";
            } // if
        } // if

        return $where;

    } // _cm_initialise