Hi Olivier and List!
Olivier, I'll have a look at the "NOW()" problem in the afternoon.
And other thing: if the field is not empty, shouldn't the NULL Checkbox be ignored ? (in tbl_replace directely).
If the browser does not support javascript, there is no way to know what is the last action the end user did : checking the "NULL" box or filling the field? Then, IMHO, both way to do (the current one or the one you suggested) are equivalent.
Loïc
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