LaTeX.org

Thanks, it helped me a lot!
cheers!

Hey guys! I have a little problem here in my LaTeX code, wich only appears when I put a \begin{center} & \end{center}, that gives me this error:

./trabli.tex:38: LaTeX Error: Something's wrong--perhaps a missing \item.

and if i don't put the begin & end {center}, but basically a \hline, give me ...