sub blackout {
    my $self = shift;
    my $message = 'hi!';
    $self->header_add(-type=>"text/plain");
    my $query = $self->query();
    my $output =  $query->start_html();
    $output .= $query->span($message);
    $self->add_json_header(boStatus=>'OK');
    $self->add_json_header(boError=>'SUCCESS');
    $self->add_json_header(boMessage=>$message);
    $output .= $query->end_html;
    return $output;
}