engines = Engine.find(:all)
      engine_ids = Array.new
      engines.each {|e| engine_ids << e.id }


      referers = RefererLog.find(:all,
        :include => [:referer_host],
        :conditions => ["_site_id = ? AND _ts BETWEEN ? AND ? AND _host IN("+ engine_ids.join(',') +")", @session[:user][:shop_id],@session[:period].to_time.to_i, @session[:duration].to_time.to_i]
      )