How to kill easygui dialog?

[utabintarbo at gmail.com]

I am using an easygui(http://www.ferg.org/easygui/index.html) dialog
(enterbox) to retrieve some info from a user. The program then goes on
and does a bit of processing, sometimes for several minutes. In the
meantime, the dialog stays there, dead but visible. I would prefer that
either another dialog ("Processing....") would be shown while
background stuff happens, or that the current dialog would simply
disappear. Ideas?

TIA,
Bob