Connecting Wind 2K3 domains together

Please please someone help!!
I'm learning networking so please forgive me in advance.

We have 7 schools, all on one WAN of T1's.  The core router (Cisco) is located at the high school and from there the T1s go to each individual school.  All schools are running their own individual Windows 2003 domains.  At the other end of the T1s at each individual schools is another Cisco router (1700 series).  NATting is done at the core router to identify each individual school's IP range of addresses:

School1.forest.org - 192.168.1.0
School2.forest.org - 192.168.2.0
etc.

When the domains were put in, they were each structured to be their own domain in their own individual forest, even though the forest was named the same at each school, ie. smithelementary.ocsu.org, joneslementary.ocsu.org, etc.

Is there a way to connect all these schools together?  I've tried to create a trust between one school and another but it says it can't find the SVR record in DNS.  This is where I'm at.  If you need more info, I'm happy to provide it.  I need to get this resolved in the next week if at all possible!  If I could assign this 1000 points I would - it's that important to us.
Thanks