Figure side by side

[Seneschal Jerome]

Hi,

I am new on the list.
I have some problem with figure
I would like to put two flottant figures side by side in Lyx as Fig 1 and Fig 
2




FIG 1 : .....                     FIG2 : ...................

I try minipage but I have only one flottant figure for two graphics (Fig 1 a) 
and b) )
A friend of mine give me a code which work under winedit
Here the code :

\begin{figure}
   \begin{minipage}[c]{.46\linewidth}
      \begin{center}\includegraphics[scale=0.75]{MOMPgood.eps}\end{center}
      \caption{\label{cap:MOMPprincipe} Principe de la transform\'{e}e MOMP. 
gabarit utilis\'{e} (gauche), objets
 d\'{e}tect\'{e}s aux positions a et c (droite) }
   \end{minipage}\hfill
   \begin{minipage}[c]{.46\linewidth}
      
\begin{center}\includegraphics[scale=0.3]{PalpageCylindrePrincipe.eps}\end{center}
      \caption{\label{cap:MOMPDetectPics} Palpeurs cylindriques et 
d\'{e}tection de pics }
   \end{minipage}
\end{figure}

But this code give me five errors

Could you help me?

Thanks a lot

Jérôme Seneschal