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# ref. http://www.tom.sfc.keio.ac.jp/~sakai/d/?date=20080628#p01
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alias navi_this_month__orig__navi_user_day navi_user_day
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result = navi_this_month__orig__navi_user_day
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this_month = @date.strftime( '%Y%m' )
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result << navi_item( "#{@index}#{anchor this_month}", "#{navi_this_month}" )
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def navi_this_month; "月表示"; end