Add Captcha to Form, php and cold fusion form

I have a website that has 2 versions (duplicate site), an old version of a cold fusion site and a new version, written in php. I'm going to migrate the client to the php site, but I still need to add the captcha to the old cold fusion site. I need the contact form to have a captcha, prefer the free one of course. captcha dot net This is probably no more than 3 hours of work total (thats about how fast I could do it, hour and a half on each form... im slow lol) You don't need to be a cold fusion expert, this is pretty easy. I don't have time to do this and it needs to be completed soon. Let me know what questions you might have.