How do we protect development code from being stolen over the Internet?

We are a small software company that wants to keep its source code property secured without having to cut all Internet...

accessibility. To do so we got rid of all floppy disks and CD burners, but there is still an open door.

We want our programmers to be able to access the Internet for information and to send e-mail. In the mean time, we want to protect the intellectual property of our company (our source code). How can we keep our e-accessibility without the risk of seeing gigabytes of source code being sent (stolen) out of the company?
The easiest way is to do all your development on a dedicated development network that is not connected to the Internet. Maintain a separate network for Internet connectivity. On the other hand, if you need to remove all floppy drives and CD burners because you don't trust your developers, then I would suggest that you have a bigger problem on your hands than Internet security.

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