Python 2.5 compatibility. Fix #40.
Python 2.5 compatibility. Fix #40.

grengojbo/grappelli-admin-tools,grengojbo/grappelli-admin-tools-trunk,grengojbo/grappelli-admin-tools,grengojbo/grappelli-admin-tools-trunk,grengojbo/grappelli-admin-tools,grengojbo/grappelli-admin-tools-trunk