def ncx(indentarray)
      @ncx_isbn = ncx_isbn
      @ncx_doctitle = ncx_doctitle
      @ncx_navmap = ncx_navmap(indentarray)

      tmplfile = File.expand_path('./ncx/epubv2.ncx.erb', ReVIEW::Template::TEMPLATE_DIR)
      ReVIEW::Template.load(tmplfile).result(binding)
    end
def ncx(indentarray)
      @ncx_isbn = ncx_isbn
      @ncx_doctitle = ncx_doctitle
      @ncx_navmap = ncx_navmap(indentarray)

      tmplfile = File.expand_path('./ncx/epubv2.ncx.erb', ReVIEW::Template::TEMPLATE_DIR)
      ReVIEW::Template.load(tmplfile).result(binding)
    end
Return ncx content. +indentarray+ has prefix marks for each level.