$state = MT->translate("Cloning template maps for weblog...");
        $callback->($state, "tmplmaps");
        require MT::TemplateMap;
        $iter = MT::TemplateMap->load_iter({ blog_id => $old_blog_id });
        $counter = 0;
        while (my $map = $iter->()) {
            $callback->($state . " " . MT->translate("[_1] records processed...", $counter), 'tmplmaps')
                if $counter && ($counter % 100 == 0);
            $counter++;
            $map->id(0);
            $map->template_id($tmpl_map{$map->template_id});
            $map->blog_id($new_blog_id);
            $map->save or die $map->errstr;
        }
        $callback->($state . " " . MT->translate("[_1] records processed.", $counter), 'tmplmaps');