table headers

I need to create a docbook table with
a structure similar to this:

<table>

    <th></th>

    <td></td>

    <td></td>

    <th></th>

    <td></td>

    <td></td>

</table>

ie. I ned to be able to have multiple
thead sections. When I try this, the style sheets seem to put both theads
at the top of the table (which I gess makes sence). How could I create
a table with multiple table headers at varying positions in the table?

thanks in advance

tom

-- 

Tom Kirkpatrick

Web Developer - Virus Bulletin