DB_DataObject and many-to-many relationships

Been looking at the DB_DataObject framework in the excellent PEAR package, and think it looks great.

But one thing is bugging me: I can't seem to find a good way of handling many-to-many relationships using the [databasename].links.ini file (or for that sake, the [dataobj]->getLink() function)

How do i best handle this within the DB_DataObject framework?

To illustrate i can show you an example:

3 tables:

news
- id
- name
- PRI KEY (id)

pictures
- id
- path
- PRI KEY (id)

news_pictures
- news_id
- picture_id
- PRI KEY (news_id, picture_id)

--- how do I pull out which active pictures belong to a specific news ?

In advance: thank you so much :-)