code: def css( self, filelist ):
          
        
          if isinstance( filelist, basestring ):
              self.link( href=filelist, rel='stylesheet', type='text/css', media='all' )
          else:
              for file in filelist:
                  self.link( href=file, rel='stylesheet', type='text/css', media='all' )
docs: This convenience function is only useful for html.
          It adds css stylesheet(s) to the document via the <link> element.