Hilft dir das? Ich würde wirklich den schwarzen Balken nehmen, da das am eheseten aussieht als solltest so...
Du kannst natürlich das was in der filecontents Umgebung steht von vorne herein in ein extra Dokument legen. (Im gleichen Ordner oder in einem in dem latex sucht.)
Ich mach das so, weil ich mir
1. nicht besser zu helfen weiß und
2. weil es so im "beamer-system" bleibt und ich nicht anfangen muss die Paperheight oder so rumzufummeln.
\documentclass{beamer}
\usepackage[latin1]{inputenc}
\usepackage[ngerman]{babel}
\usepackage{filecontents}
\begin{filecontents}{beamerouterthememyfootwo.sty}
% this is an altered Theme myfootwo by tobig
% based on beamerouterthememiniframes.sty Copyright 2007 by Till Tantau
%
% This file may be distributed and/or modified
%
% 1. under the LaTeX Project Public License and/or
% 2. under the GNU Public License.
%
% See the file doc/licenses/LICENSE for more details.
\ProvidesPackageRCS $Header: ./beamerouterthememyfootwo.sty,v 1 2010/09/17 08:10:41 tobig $
\mode<presentation>
\setbeamercolor{section in head/foot}{parent=palette tertiary}
\setbeamercolor{subsection in head/foot}{parent=palette secondary}
\setbeamercolor{author in head/foot}{parent=subsection in head/foot}
\setbeamercolor{title in head/foot}{parent=section in head/foot}
\setbeamercolor*{black}{fg=black, bg=black}
\def\beamer@theme@footline@empty{}
\def\beamer@theme@footline@authorinstitute{
\defbeamertemplate*{footline}{myfootwo theme}
{%
\begin{beamercolorbox}[colsep=1.5pt]{upper separation line foot}
\end{beamercolorbox}
\begin{beamercolorbox}[ht=2.5ex,dp=1.125ex,%
leftskip=.3cm,rightskip=.3cm plus1fil]{author in head/foot}%
\leavevmode{\usebeamerfont{author in head/foot}\insertshortauthor}%
\hfill%
{\usebeamerfont{institute in head/foot}\usebeamercolor[fg]{institute in head/foot}\insertshortinstitute}%
\end{beamercolorbox}%
\begin{beamercolorbox}[colsep=1.5pt]{lower separation line foot}
\end{beamercolorbox}
}
}
\def\beamer@theme@footline@authortitle{
\defbeamertemplate*{footline}{myfootwo theme}
{%
\begin{beamercolorbox}[colsep=1.5pt]{upper separation line foot}
\end{beamercolorbox}
\begin{beamercolorbox}[ht=2.5ex,dp=1.125ex,%
leftskip=.3cm,rightskip=.3cm plus1fil]{title in head/foot}%
\leavevmode{\usebeamerfont{title in head/foot}\insertshorttitle}%
\hfill%
{\usebeamerfont{author in head/foot}\usebeamercolor[fg]{author in head/foot}\insertshortauthor}%
\end{beamercolorbox}%
\begin{beamercolorbox}[colsep=1.5pt]{lower separation line foot}
\end{beamercolorbox}
}
}
\def\beamer@theme@footline@institutetitle{
\defbeamertemplate*{footline}{ theme}
{%
\begin{beamercolorbox}[colsep=1.5pt]{upper separation line foot}
\end{beamercolorbox}
\begin{beamercolorbox}[ht=2.5ex,dp=1.125ex,%
leftskip=.3cm,rightskip=.3cm plus1fil]{title in head/foot}%
\leavevmode{\usebeamerfont{title in head/foot}\insertshorttitle}%
\hfill%
{\usebeamerfont{institute in head/foot}\usebeamercolor[fg]{institute in head/foot}\insertshortinstitute}%
\end{beamercolorbox}%
\begin{beamercolorbox}[colsep=1.5pt]{lower separation line foot}
\end{beamercolorbox}
}
}
\def\beamer@theme@footline@authorinstitutetitle{
\defbeamertemplate*{footline}{myfootwo theme}
{%
\begin{beamercolorbox}[colsep=1.5pt]{upper separation line foot}
\end{beamercolorbox}
\begin{beamercolorbox}[ht=2.5ex,dp=1.125ex,%
leftskip=.3cm,rightskip=.3cm plus1fil]{author in head/foot}%
\leavevmode{\usebeamerfont{author in head/foot}\insertshortauthor}%
\hfill%
{\usebeamerfont{institute in head/foot}\usebeamercolor[fg]{institute in head/foot}\insertshortinstitute}%
\end{beamercolorbox}%
\begin{beamercolorbox}[ht=2.5ex,dp=1.125ex,%
leftskip=.3cm,rightskip=.3cm plus1fil]{title in head/foot}%
{\usebeamerfont{title in head/foot}\insertshorttitle}%
\end{beamercolorbox}%
\begin{beamercolorbox}[colsep=1.5pt]{lower separation line foot}
\end{beamercolorbox}
}
}
\newif\ifbeamer@theme@subsection
\beamer@theme@subsectiontrue
\DeclareOptionBeamer{footline}{\csname beamer@theme@footline@#1\endcsname}
\DeclareOptionBeamer{subsection}[true]{\csname beamer@theme@subsection#1\endcsname}
\ProcessOptionsBeamer
\mode<presentation>
% Head
\defbeamertemplate*{headline}{myfootwo theme}
{%
\begin{beamercolorbox}[wd=\paperwidth,ht=2.25ex,dp=1ex,center]{black}
\vspace*{0pt} % ht änderum um den Balcken dicker zu machen.
\end{beamercolorbox}
\begin{beamercolorbox}[colsep=1.5pt]{upper separation line head}
\end{beamercolorbox}
\begin{beamercolorbox}{section in head/foot}
\vskip2pt\insertnavigation{\paperwidth}\vskip2pt
\end{beamercolorbox}%
\ifbeamer@theme@subsection%
\begin{beamercolorbox}[colsep=1.5pt]{middle separation line head}
\end{beamercolorbox}
\begin{beamercolorbox}[ht=2.5ex,dp=1.125ex,%
leftskip=.3cm,rightskip=.3cm plus1fil]{subsection in head/foot}
\usebeamerfont{subsection in head/foot}\insertsubsectionhead
\end{beamercolorbox}%
\fi%
\begin{beamercolorbox}[colsep=1.5pt]{lower separation line head}
\end{beamercolorbox}
}
\mode
<all>
\end{filecontents}
\usetheme{Szeged}
\useoutertheme{myfootwo}
\begin{document}
\begin{frame}
\rule{5cm}{5cm}
\end{frame}
\end{document}
