Captcha Integration

I have a contact script running running inside a lightwindow that I want to integrate a captcha with. I'd like the CSS to be fixed to make the lightwindow look right after the captcha is installed and I want a log of changes while this is done. I can almost do this on my own, as integrating captcha is not usually hard, but since I am already using a lightwindow script and a script to send the email, I can't figure out how to get another action on the form, and I'd rather pay someone a few bucks who is smarter than I am. :)