Even if user is logged as root or uploader.

Have fun with the slideshow

I plead guilty, it's for IE not to fall into quirks mode.
Otherwhise it's not a problem for any other browser.

The goal is not to send the form if the username is already taken.
This is checked by a ajax call.

To do that I have used the jquery validation engine
and the jquery i18n plugin to internationalize it.
It's now easy to add validation of any kind to other
form and to translate other part in js.

The validation is divided in different part.
All the validations that are written above the fields
are enforced like only number & letter or min
6 char.
But there is also an ajax call that's made to make
sure the username is not already taken.
If the form fail to comply with any of those validation
it won't be send and a prompt will show with a
message explaining the problem.