LINKSYS WRV54G to 2811 VPN Connection: Can someone point me in theright direction?

I have a 2811 at the office, and a WRV54G at home; the office router
hosts IPSec VPN to 70 or so laptop users, using RADIUS and group
access.

Now, I have a need to start setting up certain home offices with
tunnels, so I bought myself a Linksys VPN router to start with. I
looked at it one night and got NOWHERE. My questions are basic - I
can work from there, I think.

Considering I cannot interrupt the existing VPN type, can I add a
second VPN-type to accomodate home offices?

If so, what type of VPN - EzVPN, etc. There seem to be several ways,
and I don't want to screw up the existing configuration.

Any friendly advice would be most helpful.

Cheers,

phil