Prosper and verbatim

I'm trying to get verbatim text inside a proper slide, but I just can't get it 
right. I put something like this:

\overlays{5}{
\begin{slide}[Split]{}
\FromSlide{1} {\tt if}, {\tt else}, {\tt elseif} \\ \bigskip
\begin{verbatim}
\begin{slide}{}
if(funcCondicional()){

}
\end{slide}
\end{verbatim}
\FromSlide{2} {\tt while}, {\tt do ... while} \\ \bigskip
\FromSlide{3} {\tt for}, {\tt foreach}, {\tt break}, {\tt continue} \\ 
\bigskip
\FromSlide{4} {\tt switch (case)} \\ \bigskip
\FromSlide{5} {\tt return}
\end{slide}}

And it throughts lots of errors:

Seminar.sty error.   Type  H <return>  for immediate help.

! Nested slide environments. Perhaps missing \end{slide}. May be fatal
.
\@seminarerr ...diate help.^^J}\errmessage {#1^^J}
                                                  
l.90 \end{slide}}


Any ideas?

-- 
 16:41:39 up 56 days,  1:05,  1 user,  load average: 1.23, 0.98, 0.95
-----------------------------------------------------------------
Martín Marqués        | select 'mmarques' || '@' || 'unl.edu.ar'
Centro de Telematica  |  DBA, Programador, Administrador
             Universidad Nacional
                  del Litoral
-----------------------------------------------------------------


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