VNC – Making it work externally?

Ok here’s the deal – I’m loving how VNC works. I’m using it on our LAN in limited fashion for aiding us in troubleshooting client’s desktops remotely.

I’d like to bring it a step further now though and I’d like to know how to get VNC to work through the Internet (external from our LAN).

We do NOT have a DNS server. But since our clients are using the class C private (reserved) address scheme (192.168.1.X) that’s obviously neither routable or unique.

How could I get my computer at my house to connect to my system at work using VNC?

The clients are all Win98SE

Servers that are relevant to those clients are all Win NT 4