add CAPTCHA to form

I have a simple form on my site that collects name and email address. I need to add Captcha to the form. I want it set up so the individual sees the CAPTCHA and has to input info before the form is submitted. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) 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). ## Platform the site is ran on an apache server. and the site is html