[themes] Function to print the secondary element of a non-active menu?

[danyv at focusweb.ca]

While using primary links with secondary links as sub-items, is there  
a function to print all the secondary links for a given non-active  
primary link?

For example:

-A
  |-1
  |-2
-B
  |-3
  |-4
-C
  |-5
  |-6

Let us say I click on primary link A but I'd like to print somewhere  
on the page the secondary links under B (3 and 4).  Is there a way to  
do it?

My PHP skills aren't that great and I've been reading a lot about  
Drupal but I can't seem to find the function I need to do that.

Thanks for any help.
--
Dany V.