Problem with taskbar / xinerama

[Nicolas]

Hello,

I'm running XFCE 4.0.0 on Debian. I have 3 monitors, and I use Xinerama.
Everything works allright, excepted the taskbar. It stays on the left
screen, and on the 2 other screens there's an empty space where the
taskbar should be (I can't drag any window onto that unused space)
I'd like the taskbar:
- to be on all the 3 screens
- or: to be on 1 screen only. I that case, I'd like to be able to use all of
  the space available on the 2 other screens.

Is there a solution?
Thanks.