Table cell highlighting with pstricks

Hello, 

after unsuccessful experimenst with colortab and colortbl I did try
to highlight cells in the table using pstricks. Everything works
fine, but when I'am using overlays, my table starts to move from left to right
on the page.
Only the last overlay is sitting on its place. Why?

Thanks for ideas,
		
				Richard Balogh


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\documentclass[final,pdf,slideColor,colorBG]{prosper}
\begin{document}

\overlays{3}{%
\begin{slide}{Color Table}

\psset{xunit=10mm, yunit=10mm}
\fromSlide{2}{\psellipse[linewidth=0.5mm,linecolor=blue](1.93,0.1)(0.75,0.25)}
\fromSlide{3}{\psframe[fillstyle=solid, linestyle=none, fillcolor=red](1.23,-0.77)(2.64,-0.25)}
\begin{tabular}{|c|c|}
\hline
 100  &   +0,16    \\ \hline
 120  &   +0,06    \\ \hline
 140  &   +0,06    \\ \hline
\end{tabular}

%\rput(0,0.9){\psgrid[subgriddiv=0, gridlabels=5pt](0,-1)(4,8)}

\end{slide}}

\end{document}

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