Use #each_line instead of #lines for Ruby 1.8.6

    # Returns source code as HTML with lines starting doc-comments specially marked.

    def to_html

      linenr = 0

      return @contents.lines.map do |line|

      lines = []

      # Use #each_line instead of #lines to support Ruby 1.6

      @contents.each_line do |line|

        linenr += 1;

        line = CGI.escapeHTML(line)

        # wrap the line in as many spans as there are links to this line number.

            line = "<span id='#{id(doc)}'>#{line}</span>"

          end

        end

        line

      end.join()

        lines << line

      end

      lines.join()

    end

    def id(doc)