Using CDs to seed mirror?

[tod@mountwashington.org]

I've got an official CD-ROM set of Debian 2.2r2 i386. I'd 
like to set up an in-house HTTP mirror to use for 
installations and upgrades, particularly for machines without 
CD-ROM drives.  

I tried copying the contents of the 3 CDs into a directory 
which I made available via HTTP, but when I hit this mirror 
from a machine running version 2.1 with
"apt-get upgrade ; apt-get -s dist-upgrade"
it downloads package files okay but only wants to upgrade 
xntp3.  

Is there a way I can properly set up this HTTP mirror from 
the CDs? My net connection is too slow to mirror the normal 
way.  

Thanks.