# File lib/amazon/search.rb, line 193
      def keyword_search(term, mode='books', heavy=HEAVY, page=1, price=nil)

        url = "/onca/xml3?t=%s&KeywordSearch=%s&mode=%s&f=xml" +
              "&type=%s&dev-t=%s&page=%s"
        url += "&price=%s" % price unless price.nil?
        type = heavy ? 'heavy' : 'lite'
        term = url_encode(term)

        unless Search.modes.include? mode
          raise ModeError, "mode must be one of %s" % Search.modes.join(', ')
        end

        mode = localise_mode(mode)
        search(url % [@id, term, mode, type, @token, page])
      end