%\addheadbox{section in head/foot}{\tiny\quad 1. Box}
%\addfootbox{structure}{\tiny\quad 2. Box}

%\setbeamercolor*{upper separation line head}{bg=red,fg=red}

%\makeatletter
%\setbeamertemplate{headline}
%{%
%%	\begin{beamercolorbox}{section in head/foot}
%%		\vskip2pt\insertnavigation{\paperwidth}\vskip2pt
%%		aaa
%%	\end{beamercolorbox}%
%  \begin{beamercolorbox}[colsep=1.5pt]{upper separation line head}
%\end{beamercolorbox}
%\begin{beamercolorbox}{section in head/foot}
%	\vskip2pt\insertnavigation{\paperwidth}\vskip2pt
%\end{beamercolorbox}%
%\ifbeamer@theme@subsection%
%\begin{beamercolorbox}[colsep=1.5pt]{middle separation line head}
%\end{beamercolorbox}
%\begin{beamercolorbox}[ht=2.5ex,dp=1.125ex,%
%	leftskip=.3cm,rightskip=.3cm plus1fil]{subsection in head/foot}
%	\usebeamerfont{subsection in head/foot}\insertsubsectionhead
%\end{beamercolorbox}%
%\fi%
%\begin{beamercolorbox}[colsep=1.5pt]{lower separation line head}
%\end{beamercolorbox}
%}
%\makeatother