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In an existing document which is not to be modified (except for the preamble), all instances of \begin{verbatim}...\end{verbatim} should have their contents rendered not only in a monospaced font but also on a grey background.

How can this be done?

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enter image description here

\documentclass{article}

\usepackage{color}

\let\oldv\verbatim
\let\oldendv\endverbatim

\def\verbatim{\par\setbox0\vbox\bgroup\oldv}
\def\endverbatim{\oldendv\egroup\fboxsep0pt \noindent\colorbox[gray]{0.8}{\usebox0}\par}

\begin{document}

text text text text text 
text text text text text 
text text text text text 
text text text text text 
text text text text text 
\begin{verbatim}
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123\foo{\ $ &
}
\end{verbatim}
text text text text text 
text text text text text 
text text text text text 
text text text text text 
text text text text text 

\end{document}
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