How To Pass Parameter Back From Web Service If An Insert To A Database Successfull

I have a web form and I use jQuery/AJAX/JASON to send objects to a web service using

$.ajax({
type: "POST",
url: "SynchroniseCustomers.asmx/synchroniseCustomers",
data: JSON.stringify(customerObj),
contentType: "application/json; charset=utf-8",
dataType: "json",
error: function (xhr, status) {},
success: function (msg) {}
});

From the web service I want to check if the insert into the database was successfull, return a variable with an ID and pass this ID to a function. In the object I have the ID so I could have

success: function (msg) {deleteCustomer(ID);}

But this only checks if the data was passed to my method in the web service? I have followed this example http://encosia.com/2009/04/07/using-complex-types-to-make-calling-services-less-complex/ and in the class Person I get a message back from the database server telling me if the insert was successfull or not so like

if (successfull)
{
return ID;
}

is there a way to get this ID back to the web form and use this in a variable?