# File lib/nicovideo/base.rb, line 10
    def initialize mail=nil, password=nil, auto_login=true
      @mail = mail
      @password = password
      @agent = WWW::Mechanize.new()
      agent_init(auto_login)
      @agent.set_account(@mail, @password)

      # for parameters current video
      @vp = nil
      self
    end