Getting graphs into LaTeX

Which I try to compile with the command:  pdflatex trix.tex

But then, I get this error:
------------------------------------------------------------------------------------
! LaTeX Error: Unknown graphics extension: .eps.

"pdflatex" wants pdf-pics, not eps. If you want to use both, latex &
pdflaex, save one version with pdf(), one version with postscript
and use \includegraphics{~/xx} without ending. pdflatex & latex
will choose the appropiate file. 
pm

P.Malewski, Limmerstr.47, 30451 Hannover, 0511-2135008
At work: http://www.MH-Hannover.de 0511 532 3194 / Fax: 0511 532 3190, 
P.Malewski at tu-bs.de, peter.malewski at gmx.de, malewski.peter at mh-hannover.de.