Problem with integrating Facebook Event Tracking to Submit Buttons

Hey,
I already discovered this and tried it that way: https://kriesi.at/documentation/enfold/contact-form/#add-on-click-event-to-the-contact-form-submit-button-

I tried it with the following Code:

add_filter(‘avf_contact_form_submit_button_attr’,’avia_add_submit_attributes_to_cf’, 10, 3);
function avia_add_submit_attributes_to_cf($att, $formID, $form_params)
{
$att = “onclick=”fbq(‘track’, ‘Contact’);””;
return $att;
}

I get this error: syntax error, unexpected ‘fbq’ (T_STRING)

Do you have any idea where the problem is and may be able to update your documentation?

Thanks in advance!