Hello, I use the package fancyhdr, then I put in the header:
\begin{picture}(0,0)
\put(-32,-4){\includegraphics[scale=1]{example.eps}}
\end{picture}}
With the put command you can change the position of the image, with the scale
you can change the size.
You have to put a \usepackage{graphicx} in the preamble, otherwise you get an
error (I had this problem a couple of weeks ago)
