\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}} 
{}