I've had my thoughts on a verification system for a while, too, but the way pages are rendered definitely does step in the way. I've made an ajax verification system before, not for Mysidia, of course, so I may attempt to hack it in somehow. I'll be sure and post the results someplace.
(Whether or not it's bad practice to or not to have a separate file comes down to a variety of things. I'd think of it like css. Sometimes you may need to do a little inline styling and that's fine, especially if it's only ever going to be used on that one thing. I'd say it's definitely useless to include anything on every single page if its not actively being used on it, but again, the way pages are rendered right now makes that hard. You could probably echo in a <script> only where it's used, but depending on what it is, you may need to creatively queue the script to only run after the page, and jQuery, has loaded.)
As for what you're doing here and now with the keyup and such... I'd personally recommend only checking the database once the input box as lost focus and they've tabbed or clicked away...? I think that's how I did it...?
Good luck, though. I'll try my hand at it, but probably in a week or two. I've got some other commitments right now.
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