Code environment for XeLaTeX

I found myself wanting an environment for outputting code samples and examples, in order to produce some standards documentation. After a couple of iterations I came up with the following:

\definecolor{altlinecolor} {rgb}{0.7,0.7,0.7}
\renewcommand{\FancyVerbFormatLine}[1]{%
\ifodd\value{FancyVerbLine}%
\colorbox{altlinecolor}{
\hspace{-0.04in}\makebox[\textwidth - 16pt][l]{#1}
}\else#1\fi}
\DefineVerbatimEnvironment{CleanCode}{Verbatim}
{
frame=single,
framesep=2mm,
labelposition=topline,
numbers=left,
formatcom=\vspace{0.2in}
}
view raw code_environment.tex hosted with ❤ by GitHub

Then all I need to do is wrapper this environment around the code in question.

\begin{CleanCode}
//your comments
var iables = and function(calls);
\end{CleanCode}

Cheers.