Hi,
If the "internal" interface has a higher security level than DMZ, what you need to do is just to add a nat translation (Only if you want access from internal to DMZ and not backwards)
In version 8.2 and earlier:
Nat (Internal) 1 0 0
global (DMZ) 1 interface
In version 8.3
nat (inside,DMZ) source dynamic any interface
Hope this helps.
Mike
Mike