Webservice product design

Question

Hi all, This is a deisgn related question. I have to design a product with asp.net front-end, webservices (written in c#) middle tier and sql server backend. Now, this application will have to be generic enough, so that I can customize just the front-end (html) for different customers. The webservices and the backend will remain the same. What would be the best way to design this product? One idea that I have is, use XSL templates for the page design and load data using html. But doing it this way, can I do complicated html design using stylesheets? Or is there a better way of doing this? Any help would be greatly appreciated. Thanks in advance, Moses.