using pygtk to create plots on a server w/ no DISPLAY

I have a plotting library that uses pygtk with gtk.DrawingArea and
gtk.gdk.Drawable to make plots.  I would like to use it from a zope
server running on a headless linux box to dynamically generate plots
to embed n html.  If X is running on the server is there any to draw,
for example to a pixmap, and then save the figure as a PNG, and then
embed it in the html, w/o X ever launching the window?

The general sequence would be user connects to and logs onto web page
-> get user data from database -> use pygtk to make png and store it
to a tmp dir, make an IMG tag to include this png -> serve the page.

Typically when I log in to the server from a local machine w/o X, eg a
win32 machine over putty, and try to import gtk, I get the exception
"RuntimeError: could not open display".  I'm wondering if there is
anyway to use gtk in display-less mode.

Thanks, 
John Hunter
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