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This is a small piece of code that is mostly the brain child of the incredible David Walsh. His version is written in MooTools and you can see it here. There are a few differences however, I removed some of the basic form validation, I set up a Gravatar function to be called onBlur rather then keyUp because the flashing Gravatar on each key stroke just got really annoying. While I prefer MooTools I did this in jQuery because:

1. David Walsh already did an excellent MooTools version.
2. Depending on its popularity I might make this into a Wordpress plugin. And since most themes and Wordpress are already using jQuery I figured that was the largest market.
3. Some of his commenters were requesting a jQuery version.

Demo and Download

You can see it in action here.
Download a zip here.