Changing the BaseURI to resolve relative URI:s in an XSLT-stylesheet?

Hi,

need some explanations on how relative uri:s in an xml/xslt-file are resolved by microsofts xmldom parser. I would need some instructions on how to programatically change the base uri/url which is assumed by the parser.

I try to transform an xml-file using an xslt-stylesheet, which needs to reference other files (a css-stylesheet and a js-file), using relative uri:s. when these relative uri:s are resolved, however, the base uri seems to be that of the html-file in which the parsing and transformation is made (client-side) and not that of the xslt-stylesheet. (all stylesheet-files are located in a directory different from that of the html-file).

thanks,
Mats