DHCP/DNS on BDC

Hi all

I have a physical PDC (DNS/DHCP/AD) and a virtual BDC (AD). One is on win03, the other on 08

I want to add DNS/DHCP to my BDC, so if my PDC dies it will just take over. From what I understand from others, I can do this, but split the DHCP scope between them both (so give the BDC say 5 ips to look after) and if the PDC dies, I just change the scope

Does that sound right? If so, could someone point me to an article on how to do this as I can't seem to find any (which is more than likely me being thick)

Ta!