Remove box in beamer slides

Given the following minimal example of my presentation

    \documentclass[10pt]{beamer}
\usepackage[english]{babel}
\usepackage[utf8]{inputenc}

\begin{document}

\title{Nice talk}

\frame{\titlepage}

\frame{\frametitle{Agenda}\tableofcontents}

%%%%%%%%%%%%%%%%%%%%%%
\section{Introduction}
\frame{\tableofcontents[currentsection]}

\subsection{beginning}
\frame{ \frametitle{state of the art}

some explanation

}

%%%%%%%%%%%%%%%%%%%%%%
\section{Results}
\frame{\tableofcontents[currentsection]}

\subsection{outcome}
\frame{ \frametitle{results obtained}

some results

}

\end{document}


I wonder what is the name of the box that appears above all slides (Table of contents?) and how can I remove it completely on this case (without changing the style -colors, etc-)

-
Delete the line \usepackage{beamerthemeshadow}. It will change the style but remove the top box. –  N.N. Aug 30 '11 at 12:40
No, because I really like that style –  flow Aug 30 '11 at 12:45
Another ugly hack would be to add the plain option to every frame, i.e. to replace every occurrence of \frame{ with \frame[plain]{. –  N.N. Aug 30 '11 at 12:49

\setbeamertemplate{headline}{}