$('#id_form').dqe({
server : 'classes/dqe.php',
zipcity: '#id_zipcity',
street : '#id_street'
});
This form is the most minimalist template there is: you can search for the city in the "zipcity" parameter and then postal code, and city are stored in the same field.
It is also possible with this type of form to add the dependent locality, additional address information fields or even a field dedicated to the number in the street.
If you need to retrieve the postal code and city to post them separately, the window.current_zip and window.current_city variables are fed at the time of city selection and allow you to retrieve distinct values independently of the form that groups them.