You may be able to get around this by using something like dyndns to give
you a resolvable domain name that you can use from one of the tunnel ends.
I've never tried it with both ends being dynamic, but I've certainly created
IPSec tunnels from one static to one semi-static (i.e. changes once every
few days).

Regards,

Chris
-- 
C.M. Bagnall, Partner, Minotaur
Tel: (07010) 710715   Mobile: (07811) 332969   ICQ: 13350579
AIM: MinotaurUK   MSN: minotauruk at hotmail dot com   Y!: Minotaur_Chris
This email is made from 100% recycled electrons