LaTeX.org

Hi,

thats very easy (but i have searchead myself for a few hours...wanted to use it for my diplomarbeit)


\documentclass[12pt, headsepline, a4paper, fleqn, oneside] {scrreprt} % (for example)
\begin{document}
% then the first part would be "oneside"

..
..

\setboolean{@twoside}{true}
% now you ...