Backgorund color of tabke headers in FO output

Hi,

I'd like to be able to set a background color for my table header in my 
FO output. I know it can be done by using a customization layer. This 
document 
(http://encolpe.degoute.free.fr/UsingDocbookXSL/SolveProblems.html#d0e11421) 
only talk about HTML output. How do I do this for FO output?

Thanks,

Danny