1 \usepackage{etex}

     2 \usepackage{pgfpages}

     3 

     4 \usepackage{color}

     5 

     6 \usepackage{tikz}

     7 \usetikzlibrary{shapes}

     8 \usetikzlibrary{backgrounds}

     9 

    10 % beamer mode

    11 \mode<beamer>{

    12  \usetheme{Warsaw}

    13 }

    14 

    15 % transparency mode

    16 \mode<trans>{

    17  \usetheme{Warsaw}

    18 }

    19 

    20 % handout mode

    21 \mode<handout>{

    22  \usetheme{default}

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

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

    25 }

    26 

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

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

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