Accessing a firewalled CVS server via 'un-firewalled' host

[junk5]

Hi all

I used to be able to access my work's CVS server from home, but it's
recently been firewalled. I can't even SSH to it. I can, however, SSH
to my desktop machine that is allowed to use the CVS server. In
principle I'm allowed to access the CVS server from home, but in
practice it has been made difficult (and IT haven't had the foresight
to enable SSH connections to the server).

This isn't a question about using CVS over SSH that needs an CVS_RSH
answer :-)

What I'd like to do is be able to co, commit etc. from my home machine,
by talking to the CVS server via my work desktop machine. I think this
must be possible by using SSH tunelling or something, but I'm not
experienced enough to know how to achieve what I want. Can someone
point me in the right direction?

Thanks

C