def get_series_banners(seriesid)
      request_url = "#{@apikey}/series/#{seriesid}/banners.xml"
      request_url = URI.join(BASE_URL, 'api/', request_url)
      response = self.class.get(request_url).parsed_response
      return nil unless response["Banners"]
      return nil unless response["Banners"]["Banner"]
      case response["Banners"]["Banner"]
        when Array
          response["Banners"]["Banner"].map {|s|Banner.new(self, s)}
        when Hash
          [Banner.new(self, response["Banners"]["Banner"])]
        else
          []
      end
    end
def get_series_banners(seriesid)
      request_url = "#{@apikey}/series/#{seriesid}/banners.xml"
      request_url = URI.join(BASE_URL, 'api/', request_url)
      response = self.class.get(request_url).parsed_response
      return nil unless response["Banners"]
      return nil unless response["Banners"]["Banner"]
      case response["Banners"]["Banner"]
        when Array
          response["Banners"]["Banner"].map {|s|Banner.new(self, s)}
        when Hash
          [Banner.new(self, response["Banners"]["Banner"])]
        else
          []
      end
    end
Retrieves the banners for a given series by its series id.
 Parameters::
   +seriesid+::  The TheTvDb assigned unique identifier for the series to access.
 Returns::   An array of TheTvDbParty::Banner instances or +nil+ if the banners could not be retrieved. Note: may return [] if banners are retrieved but there are none.