final String relCssFilename, UserSession uSess) {
cssUriMapper = new Mapper() {
public MediaResource handle(String relPath,
HttpServletRequest request) {
VFSItem vfsItem = cssBaseContainer.resolve(relPath);
MediaResource mr;
if (vfsItem == null || !(vfsItem instanceof VFSLeaf))
mr = new NotFoundMediaResource(relPath);
else
mr = new VFSMediaResource((VFSLeaf) vfsItem);
return mr;