We have a customer with a 2950 that currently uses 10.10.10.x IP addresses on their LAN. We need to create a VPN to another location who are already using the IP addressess somewhere on their LAN so they have asked me to use 10.8.2.x and map these to the 10.10.10.x range instead of changing the whole LAN range.

Is this possible, if so how would I go about doing this?

Anyone have any ideas???

There isn't a way to map IPs like that afaik, however you could do it if it can be a one-way VPN i.e. you only need to access files on their site and not the other way around. To do that, you'd set up a dial-in user account on their router and set your router's LAN to LAN profile to connect to that and in the bottom left of the LAN to LAN VPN profile, change the Route setting to NAT.