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I think I can prevent the submission of a non-checked form using Javascript, I'm more used to this way of error-handling. So I guess,

this is what I want to do.
So do I need the JSON...

Ok, first of all thank you very much for your reply. Here's what I want to do in general:
I have an html form which contains a 5x8 table.This table represents 40 seats in a concert hall.Each 'seat'...

Could you be kind to post the .php file too, so I can see how exactly the database update is done.
I have a similar task I have to do and I am a newbie, too.