如何从ASP.NET主题中排除特定的CSS文件？

I'm making a website that will have to render correctly on FF/IE6/IE7/Opera/Safari. IE6 came as a late requirement (when I had done all the other browsers) and it just has to be useable, not necessarily the same as on the other browsers. Now I'm tweaking it so that it's useable on IE6 as well.I'm making a website that will have to render c