--- a/slides02.tex	Tue Oct 02 14:11:58 2012 +0100
+++ b/slides02.tex	Tue Oct 02 14:34:18 2012 +0100
@@ -119,6 +119,27 @@
 \end{frame}}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\mode<presentation>{
+\begin{frame}[c]
+
+\begin{center}
+\begin{tabular}[t]{c}
+\includegraphics[scale=1.2]{pics/barrier.jpg}\\
+future lectures
+\end{tabular}\;\;\;
+\onslide<2>{
+\begin{tabular}[t]{c}
+\includegraphics[scale=0.32]{pics/trainwreck.jpg}\\
+today
+\end{tabular}
+}
+\end{center}
+
+  
+\end{frame}}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
+
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \mode<presentation>{
@@ -312,7 +333,7 @@
 \begin{frame}[c]
 
 \small
-A programmer might be careful, but still introducing vulnerabilities:\bigskip
+A programmer might be careful, but still introduce vulnerabilities:\bigskip
 
 {\lstset{language=Java}\fontsize{8}{10}\selectfont%
 \texttt{\lstinputlisting{C2a.c}}}
@@ -330,7 +351,7 @@
 \item the idea is you store some code as part to the buffer
 \item you then override the return address to execute this payload\medskip
 \item normally you start a root-shell\pause
-\item difficulty is to guess the place where to ``jump''
+\item difficulty is to guess the right place where to ``jump''
 \end{itemize}
   
 \end{frame}}