High Availability using 2 sites

[tim at registriesltd.com.au (Tim Edwards)]

We currently have a backup site at a different location to our main 
site. This backup site mirrors (as closely as possible) our main 
services, particularly web serving. Is there a way to have the backup 
site act as a failover for the main site using something like Linux-HA? 
They are on seperate internet connections with different IP ranges.

Thanks
--
Tim Edwards