# How to fit title and author into footline of the CambridgeUS beamer theme

I am writing a presentation using a beamer theme; the code I wrote is this:

\documentclass{beamer}
%\documentclass[handout]{beamer}

% THIS PUTS TWO SLIDES ON EACH PAGE
%\usepackage{pgfpages}
%\pgfpagesuselayout{2 on 1}[a4paper,border shrink=5mm]

\usetheme{CambridgeUS}
\usepackage{time}             % date and time
\usepackage{graphicx, epsfig}
\usepackage[T1]{fontenc}      % european characters
\usepackage{amssymb,amsmath}  % use mathematical symbols
\usepackage{palatino}         % use palatino as the default font
\usepackage{multimedia}
\usepackage{subfigure}
\usepackage{mathrsfs}

%\setbeamercovered{transparent}

% SOME COMMANDS I'VE CREATED FOR LONG COMMANDS I USE OFTEN
\newcommand{\ds}{\displaystyle}
\newcommand{\ve}{\varepsilon}
\newcommand{\der}[2]{\frac{d #1}{d #2}}
\newcommand{\pder}[2]{\frac{\partial #1}{\partial #2}}
\newcommand{\inv}{^{-1}}
\newcommand{\mat}[1]{\textbf{#1}}

\title{Un titolo a caso}
%\subtitle{An Introduction}
\author{\small Author: pinco\\
Assistant: pallo}
\institute{\large Polimi\\
\footnotesize Facolt\'a delle merendine industriali\\
\small Corso in cannoli e bomboloni} % COMMAND UNIQUE TO BEAMER
\date{\today}

\begin{document}

\begin{frame}
\titlepage
\end{frame}

\end{document}


The output that I get is this:

Here are the problems:

1) as you can see in the red box below the text does not fit; what you see is this: "Author: pinco Assinstan: pa". What I would like to have is just the name of the author: "pinco" and nothing else in it.

2) The same problem persists in the grey box which should contain the title of this frame; however what I want is to display the word "Polifighe" instead.

Can tell me what should I change in my code in order to achieve my goals?

As described in section 3.3 of the beamer documentation, \title, \author, etc. accept optional short arguments in square brackets. This short version will be placed into the footline.

\documentclass{beamer}
\usetheme{CambridgeUS}
\usepackage[T1]{fontenc}      % european characters
\usepackage{amssymb,amsmath}  % use mathematical symbols
\usepackage{palatino}         % use palatino as the default font

\title[Polifighe]{Super long title that does not fit in the grey box below}
%\subtitle{An Introduction}
\author[pinco]{\small Author: pinco\\
Assistant: pallo}
\institute[]{\large Polimi\\
\footnotesize Facolt\'a delle merendine industriali\\
\small Corso in cannoli e bomboloni} % COMMAND UNIQUE TO BEAMER
\date{\today}

\begin{document}
\begin{frame}
\titlepage
\end{frame}
\end{document}


Note the empty [] after \institute. Without this, the institute will follow the author in the footline.