fancystep

I am trying to adapt some of the nice effects that
fancysteps example shows, but it seems that the use of them
are rather tricky. The idea is to present some titles with
nice effects such as:

\foilhead{}

\begin{center}
      \movie*{\value{nosteps}}{0.01}[\pageDuration{1}]
      {%
        \makebox[0pt]
        {\rule{2\textwidth-2\textwidth/\value{nosteps}*\value{substep}}{0pt} INTRODUCTION}%
        }
\end{center}

but the result is that I get some strange symbols on top of
the foil (I sm using foiltex). The log file says:

! Undefined control sequence.
<recently read> \switch 
                        
l.36         }
              
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

So: what am I missing?.

Best regards,


Agustin



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