Rewrite of captcha-like feature

The captcha-like [1] feature on behalf of the blog comments for this weblog has been rewritten. If it does not work for you as expected, please let me know. The feature is based on a completely homegrown implementation written in PHP and adopted to b2/cafelog. If you like something similar then you might like to have a look at the PEAR captcha package [2].

[1] http://en.wikipedia.org/wiki/Captcha
[2] http://pear.php.net/pepr/pepr-proposal-show.php?id=80

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