Saturn, I was trying to help you in the other forum/thread and I guess you got impatient or something.
Like I said in the other thread, you need to get your forwarders set up correctly. You could also hand out suffixes via GPO. You could even set up zone transfers, but since you've said you're not all that familiar with DNS, I was just trying to give you a simple solution.
Just do what I said in the other thread, and that should work for you.