$ erubis -XC example11.rhtml
_buf = '';
     if @list.nil? || @list.empty? 
     else 
         @list.each_with_index do |item, i| 
                      _buf << ( i % 2 == 0 ? '#FCC' : '#CCF' ).to_s;
               _buf << ( item ).to_s;
         end 
     end 
_buf.to_s
