A while ago I came across this guide, as I was searching for some simple captcha implementation for some website. Plain and simple, all clear. The only thing I didn't like too much is the javascript part, for webpages I mainly use jQuery for javascripting, so I wanted to use jquery for ajax functions. Also, including multiple inputs besides captcha code makes javscript more comeplex (please read the comments, near the end) nad that is where jquery comes in handy.

The simplest possible example you can find on http://mihap.si/share/captcha/.

What we need:

• HTML code and php image generation code
• jQuery library and script
• PHP page for input verification

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