HTML Parameters for Tables

Could someone please let me know which XSL stylesheet file / element or 
HTML parameter to modify to :

remove the <b> tags from table titles in HTML output.

I am using docbook-xsl-1.67.2  & docbook-xml-4.4CR2

Cheers,        Tristan
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Tristan J. Fiedler
Postdoctoral Fellow - Stein Lab
Cold Spring Harbor Laboratory