add passcode to my guestbook

I have a very nice guest book that runs using cgi and perl I need to add a script on the sign guestbook script that has some type of passcode entry to protect spaming junk mail from posting on the guest book if you have experience and can fix it please ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). * * *This broadcast message was sent to all bidders on Wednesday Nov 8, 2006 7:11:08 AM: look for a knoledge perl and cgi just to add a passcode to my sign guestbook perl script to prevent junk posting and will prevent sripts that run a submit junk to people guestbook ## Platform unix server usning perl and cgi knowledge