[xsl] Change values with http params?

["Scott Purcell" <spurcell@xxxxxxxxxxxxx>]

Is it possible to change values in a xsl file using a http querystring with values?
eg something like this:
<bgcolor>$red</bgcolor>
Then have a querystring from a http submit that has "?bgcolor=red&fgcolor=blue" 

I somehow needto make dynamic variables and then transform the xml and xsl using xalan.

Thanks,

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