[Zope] small <bobobase_modification_time> problem

[Damir Bartakovic]

Following Problem:

I am using <bobobase_modification_time> in my standard_html_footer. 
It works fine if I am changing the index_html in which the
standard_html_footer is included.
But the index_html has also a variable "news"(dtml-method) included. If I
am changing the news, the <bobobase_modification_time> doesn't change ;-(.
So my Site changed, but not the modification time. Is there a way to
solve this?

thanks 
Damir