\def\GWslideCz{
\begin{frame} \frametitle{Princip fúzní elektrárny}
  \begin{figure}[t]
    \centering
    \GWig{width=0.7\textwidth}{Theory/Fusion/FusionIntro/FusionPowerPlant/image-20150513-2479-g97xlb.png}
  \end{figure}
\end{frame}}

\def\GWslide{
\begin{frame} \frametitle{The dream}
  \begin{figure}[t]
    \centering
    \GWig{width=0.9\textwidth}{Theory/Fusion/FusionIntro/FusionPowerPlant/original.jpg}
  \end{figure}
\end{frame}}