docbook question: how to center cell in tables ?

Hi there,

I want to center a content of table's cell
(ex. http://mira.sai.msu.su/~megera/pgsql/lockmatrix/c2.html),
but jade seems doesn't generate a right html code.

sgml code looks like:
 <table id="lock-matrix" frame="topbot" pgwide="1">   <title>Lock Matrix</title>   <tgroup cols="10" align="center">
<thead>   <row>     <entry> </entry>
 

I run
jade -d stylesheet.dsl -i output-html -t sgml test.sgml

What I'm doing wrong ?
    Regards,        Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83