How to merge do databases
 

Hello there.
I have do databes, there is a newer one and a older one.
the newer contains all of the olders user table + some new users.

But the posts, forums and threads are not the same.

I want to marge the two databases that only the older user table won't be merged with the new one.
only to copy the posts, forums and threads.

How can i do that?
Help me please.
Hagai.