How about this one, I've been experimenting with, uses plain HTML obfuscating 
the code with various css techiques.

http://ren.dotgeek.org/ex/captchacss.php

http://ren.dotgeek.org/ex/captchacss.phps

Jared

> 
> I don't think that the math-test would prevent much spam. 
> It's very easy to automatically read and solve these equations.
> 
> Would a verified note submission (e.g. the user provides his 
> eMail- address and he gets a message where he has to click on 
> a link to publish his note) be a better solution? Personally, 
> I think that even that may be bypassed.
> 
> Viele Grüße
> 
> Sebastian
> 
> Am 21.02.2006 um 12:56 schrieb Friedhelm Betz:
> 
> > Derick Rethans wrote:
> >> On Tue, 21 Feb 2006, Dan Scott wrote:
> >>> Spammers suck.
> >>>
> >>> I would be in favour of implementing a basic mathematical 
> >>> skill-testing question a la Lukas Smith's blog at 
> >>> http://pooteeweet.org -- it is a protection method that is still 
> >>> accessible to the visually impaired, unlike classic CAPTCHA.
> >> Agreed, spammers suck, but CAPTCHAs too.
> >
> > Yeah, I don't like CAPTCHAs either. Mainly for the reason Dan 
> > outlined.
> >
> >> Don't let the spammers win! :)
> > Not at all ;-)
> >
> > What about: "basic mathematical
> > skill-testing question" ?
> >
> > Friedhelm
> >
> >
> 

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