failover for http

[RYAN vAN GINNEKEN]

Does anyone know of a good package or howto that covers the failover 
topic??  I have found lots of stuff on google but hard to know if these 
progs do what i need.   There has to be something in the ports that 
archive this spread with wackmole maybe seems very complex and not even 
sure it will suit my needs???

I have 2 server in different locations with different ip's is it 
possible to have these servers back each other up?  I have read ip on 
the cheap from the Unix hacks book but it does not seem to cover the 
different location and ip issue. 

Please a point in the right direction would be great.