[jQuery] saving values from a multi select list.

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Im using a plugin called select chain and modified it a bit. Right now
im trying to pass only selected values of a multi select list through
ajax. The following function does a bit more but im concerned with the
part that says

cust_val: customer.val().join(",")

This should return only selected values. This is what happens if i put
it in an alert().   however when i check firebug to see what was
posted it shows the entire list. I've tried alternatives like
option:selected.... they all work for aler() .. the info passed
through ajax shows the entire list.

please help.




customer.selectChain({
                                        target: market,
                                        url: callback_url,
                                        type: "POST",
                                        data: { ajax: true, multsel: 
market_selects, cust_val:
customer.val().join(",")  }
                     }).trigger('change');