> I'm transforming on the server-side using an ASP script as follows:
>
> <%
> 'Load XML
> set xml = Server.CreateObject("Microsoft.XMLDOM")
> xml.async = false
> xml.load(Server.MapPath("index1.xml"))
>
> 'Load XSL
> set xsl = Server.CreateObject("Microsoft.XMLDOM")
> xsl.async = false
> xsl.load(Server.MapPath("index1.xsl"))
>
> 'Transform file
> Response.Write(xml.transformNode(xsl))
> %>
>
> The results are sent down the wire to the user as a plain HTML file.

....so what's wrong with checking which client (user-agent) is making
the request and using the appropriate stylesheet?  This is an ASP
question, not much to do with XSLT.  That code look's like a lot like a
cut + paste from w3schools as well, you might want to update those
progids as well.