% add changemargin environments
\newenvironment{changemargin}[2]{%
\begin{list}{}{%
	\setlength{\topsep}{0pt}%
	\setlength{\leftmargin}{#1}%
	\setlength{\rightmargin}{#2}%
	\setlength{\listparindent}{\parindent}%
	%\setlength{\itemindent}{\parindent}%
	\setlength{\parsep}{\parskip}%
}%
\item[]}
{\end{list}}