Hi Kenneth,
The problem is that according to your previous posts you want to perform a client-side transformation and therefore you use the ....WD-xsl namespace.
This namespace doesn't support parameters as input for your stylesheet, thus you won't be able to 'communicate' with your stylesheet.
I guess you use MSIE as platform, so why don't you use javascript to solve your problem?
Just load your xml in a domdocument object and use the 'SelectSingleNode' method to select the person node from your xml you need.
Good luck!
Jordi Reineman
Cap Gemini Ernst & Young