\usepackage{etex}

\usepackage{pgfpages}

\usepackage{color}

\usepackage{tikz}

\usetikzlibrary{shapes}

\usetikzlibrary{backgrounds}

% beamer mode

\mode<beamer>{

\useinnertheme[shadow=true]{rounded}

\useoutertheme{shadow}

\usecolortheme{orchid}

\usecolortheme{whale}

\setbeamerfont{block title}{size={}}

\setbeamertemplate{headline}

{%

}

\setbeamertemplate{footline}

{%

  \leavevmode%

  \hbox{\begin{beamercolorbox}[wd=.25\paperwidth,ht=2.5ex,dp=1.125ex,leftskip=.3cm,rightskip=.3cm]{author in head/foot}%

    \usebeamerfont{author in head/foot}\insertshortauthor

  \end{beamercolorbox}%

  \begin{beamercolorbox}[wd=.25\paperwidth,ht=2.5ex,dp=1.125ex,leftskip=.3cm,rightskip=.3cm]{title in head/foot}%

    \usebeamerfont{title in head/foot}\insertshorttitle

  \end{beamercolorbox}}%

    \begin{beamercolorbox}[wd=.5\paperwidth,ht=2.5ex,dp=1.125ex]{section in head/foot}%

    \insertsectionnavigationhorizontal{.5\paperwidth}{}{\hskip0pt plus1filll}%

  \end{beamercolorbox}%

  \vskip0pt%

}

}

% transparency mode

\mode<trans>{

 \usetheme{Warsaw}

}

% handout mode

\mode<handout>{

 \usetheme{default}

 \setbeamercolor{background canvas}{bg=black!5}

 \pgfpagesuselayout{4 on 1}[letterpaper,landscape,border shrink=2.5mm]

}

\newcommand{\return}[2]{\hyperlink{#1}{\beamerreturnbutton{#2}}}

\newcommand{\goto}[2]{\hyperlink{#1}{\beamergotobutton{#2}}}

\newcommand{\skipto}[2]{\hyperlink{#1}{\beamerskipbutton{#2}}}

\beamertemplatetransparentcovered 

\setbeamertemplate{navigation symbols}{}  % no navigation symbols, please

\mode<beamer>{\setbeamercolor{block title}{bg=green!40!black}}

\beamersetuncovermixins 

{\opaqueness<1->{60}} 

{}