Code Signing an ACTIVE Form (How?)

I have managed to created an activeform in Delphi3.0  that works fine.
I need to be able to sign this code to allow other users on the network to
use the Active X in their browsers.
I have access to an internal Microsoft Certificate server.

Can anyone help me with the procedure on how I can sign my code
(credentials file and key) and allow users to use my control.
Do I have to get anything from Verisign or like people ?
This will only ever be used in our Intranet.
Does Certificate srv on our Intranet help somehow?

Many Thanks.

Rob Reid BBC Belfast
Any views are my own and not that of the BBC. Honest!