save_as (WWW::Mechanize::File)

    # File lib/www/mechanize/file.rb, line 55
          def save_as(filename = nil)
            if filename.nil?
              filename = @filename
              number = 1
              while(::File.exists?(filename))
                filename = "#{@filename}.#{number}"
                number += 1
              end
            end

            ::File::open(filename, "wb") { |f|
              f.write body
            }
          end