How about something like this? It produces the correct output for me, although you'll probably want the hash keys sorted some way. This may be a little sloppy for some folks, because it uses lots of auto-vivification to create the deep @tables structure. I don't mind, though. 
use HTML::Template;

my $template = qq{
<TMPL_LOOP NAME=TABLE>
  <table border=1>
    <tr><th>key</th>
      <TMPL_LOOP NAME=KEYCELL>
        <td><TMPL_VAR NAME=KEY></td>
      </TMPL_LOOP>
    </tr><tr><th>value</th>
      <TMPL_LOOP NAME=VALCELL>
        <td><TMPL_VAR NAME=VAL></td>
      </TMPL_LOOP>
    </tr>
  </table>
</TMPL_LOOP>
};

my %somehash = map(("key$_" => "val$_"), 1..15);
my $maxwidth = 6;
my @tables = ();

my $num_items = 0;
for (keys %somehash) {
    my $table_num = int($num_items++ / $maxwidth);

    push @{$tables[$table_num]{keycell}}, { key => $_ };
    push @{$tables[$table_num]{valcell}}, { val => $somehash{$_} };

}

my $template = HTML::Template->new( scalarref => \$template );
$template->param( TABLE=>\@tables );
print $template->output;

[download]

-------------
This produces the output (keys are unsorted, as you can see):

key key7 key8 key9 key10 key11 key12
value val7 val8 val9 val10 val11 val12
key key13 key14 key1 key15 key2 key3
value val13 val14 val1 val15 val2 val3
key key4 key5 key6
value val4 val5 val6

I'd be interested to see if any masterful monks can reduce the for loop to a one-liner map() statement (or a two-liner if the keycell and valcell loops must be separated). Hope this helps, and good luck. (BTW, I modified your HTML template a little bit -- added indentation, border=1, and s/key/value/ in 7th line)

Update: to fit the specifications of your original question, you should change $maxwidth to 5, as you wanted a maximum of 6 cells including the <th> tags.

In reply to Re: Nesting <TMPL_LOOP> in HTML::Template by blokhead
in thread Nesting <TMPL_LOOP> in HTML::Template by rattusillegitimus

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