JS addEvent FORM copy button .... does not work ?

[advity]

Hello Rob,

Please,

my form with the code Javascript (below) does not function with the copy button.

Fabrik.addEvent('fabrik.form.submit.start', function(form, event, button) {
form_20._getButton('submit').disabled = 'disabled';
form_20._getButton('submit').value='Un momento por favor ...';
});

Thank you in advance for your help

S?bastien