[jQuery] cant pass value to ajax call.

[shaded]

here is my code.

          $("#ddl_customer").change(function(){
                                cuslist = $("#ddl_customer").val().join(", ");
                                alert(cuslist);

                  });



                 $("#ddl_customer").selectChain({
                                        target: market,
                                        url: callback_url,
                                        type: "POST",
                                        data: { ajax: true, multsel: 
market_selects, cust_val: cuslist  }
                     }).trigger('change');

This is an except from remy sharp's plugin for chaining multiple
select boxes. I want to pass "cuslist" which is a list of numbers to
the select chain function. which is funcition that uses ajax.

this works on the first time run, does not work after. It keeps
passing the full list and not the updated list. Any idea how to fix?