% Change margins on the fly
\newenvironment{changemargin}[2]{%
        \begin{list}{}{%
                \setlength{\topsep}{0pt}%
                \setlength{\leftmargin}{#1}%
                \setlength{\rightmargin}{#2}%
                \setlength{\listparindent}{\parindent}%
                \setlength{\itemindent}{\parindent}%
                \setlength{\parsep}{\parskip}%
        }%
        \item[] ~ \par%
        % Get rid of the extra space inserted by the previous line
        \vspace*{-2em}%
}{
        \end{list}
}
