Using CapCha! on Contact Form

Hi All, I’m using WP-ContactForm on my blog, as well as CapCha! in my comments. Over the past couple of days I’ve been getting hammered with contact spam. While I’m thankful for the traffic to my humble blog, this isn’t really the response I’m looking for. Anyone know how I could implement the CapCha! that my blog is already running on the contact form? I’m not sure if it would stop the mail I’ve been receiving, but it can’t hurt.

Thanks,
Lenwood