sortable beforeStop problem

sortable beforeStop problem


Hi,
im new to jquery-ui cause i needed a sortable table now i have the
problem that
the callback beforeStop doesnt get fired at any time.
Im using this:
$("#sortable").sortable({beforeStop: function(ev ,ui) {
        alert('dzop');
    }
the same code with change, start or stop does work fine.
Second problem is, how to abort the sorting?
i want to call a website (via ajax) to update the data in the database
and if something get wrong i dont want to let the thing change their
dom position.
i really got stuck on both these problems.
Thanks in advance,
Julian