Need VPN tunnel between cisco 1721 IOS 12.2 and 2621 IOS 12.3

I need to create a tunnel from a remote 1721 that will be sending netbios traffic to a 2621.  Both routers are currently using NAT and are used for internet connectivity - in reading IPSEC, NAT, and the internet do not play nice- What do you guys think is the best solution?
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Sure they do... all play  nice that is...
Here's a step by step:

mark2m60Author Commented:
I cannot find the crypto command on one of my routers running IOS 12.3(5b). Any thoughts?

Also I am not sure which router from the above config should be the remote. I have approx 15 PC's on my main router that need internet access, will the above config hinder my NAT pool? Cant tell.
mark2m60Author Commented:
Anybody reading my questions??
>I cannot find the crypto command on one of my routers running IOS 12.3(5b). Any thoughts?
Do you have the IPSEC feature set? If you post result of 'show ver' I can tell you...

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