[Zope] ZPT Print Theme

Zope.org site have a print version with light design. How I can make "print version" like on Zope.org for my site on ZPT if all my Page Tamplates use macros from 'main_template' Page Template. "Print" attribute will be getted from GET part of REQUEST: request.print == 'on'. -- Mikhail 'Xen' Kashkin