Simple Captcha: Session ID as identifier?

[eluser]erik.brannstrom[/eluser]
[quote author="mdgross" date="1216250105"]use reCAPTCHA.net

its free, its awesome, its high tech... and you're helping to digitize books![/quote]

I did actually, however I found that it was a bit too high tech for my needs

The site I'm working on is in Swedish, which is not supported by default with reCaptcha and I didn't feel up to the task of fixing that myself. This solution also loads faster and will never cause the slightest problem when I finally get around to internationalizing the site.