The goal of this AJAX example is to allow a user who is registering for your site to see if the username they want to use is taken already or not, without having to submit a form and reload the page. I believe Digg uses this, and I hear it's all the rage for Astronomy-based dating sites. You can skip to the implemented example in action here. Yeah, I did it in ASP this time, instead of PHP...FOR NO RAISIN WHATSOEVER, except maybe to show that the same JS framework works for both ASP and PHP.
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