[Fissy]

using the "run program" action or a terminal, start gconf by typing:

gconf-editor

and hitting enter.

This program is a bit like the registry editor for windows.

In the menu on the left you need to go to /apps/metacity/general/

There is then a key in the right pane called "button_layout"

edit this key so that it reads:

close,minimize,maximize:menu

hope this helps
-fissy