# File lib/campaign_monitor.rb, line 318
    def opens
      response = @cm_client.Campaign_GetOpens("CampaignID" => @id)
      unless response["Code"].to_i != 0 
        response["SubscriberOpen"].collect{|s| SubscriberOpen.new(s["EmailAddress"], s["ListID"].to_i, s["NumberOfOpens"])}
      else
        raise response["Code"] + " - " + response["Message"]
      end
    end