Validation, re-populating array checkbox

[eluser]Kopel[/eluser]
Thanks for the reply elitemedia.

Well, the error string is not my problem.
In fact, the user can check/uncheck all or just some of these checkboxes , so they do not generate errors...

My concern was about the re-populating of the array checkbox.
Especially when the validation failed because of the others widget (like with the input text Username on my example).

I lost too much time on this crazy thing today.
Finally i did something not as clean as i would but now it works.
Anyway, if someone have THE solution, i'm still interested...

Thx