Need help with bassistance Autocomplete field entry dependency

Need help with bassistance Autocomplete field entry dependency

Hello,

I'm looking to get some help with configuring the Bassistance.de Autocomplete plugin to refresh my form based on field dependency of an entered field.

So that fields such as cities, provinces & countries are updated when a continent is chosen or vice-versa.

Using the guidelines set here:
http://docs.jquery.com/Plugins/Autocomplete#Dependencies_between_fields

I created a the code below for this form

http://wordpressclues.com/mat/form4/

and would like the form to refresh on field entry as on this form

http://wordpressclues.com/mat/airportsearch/docs/

#fromcountry / #fromcontinent are the form input field IDs
fromcountries is variable which holds the data for countries from the DB

I think the problem is here as I don't know what variable to put here and have tried a lot of combination which none seem to work.
"fromcontinent: function()"

I have 6 dependencies per field that need to update for each valid field entry. Any help would be appreciated.  Thanks...

    $("#fromcountry").autocomplete(fromcountries, {

        minChars: 0,
        width: 260,
        matchContains: false,
        autoFill: false,
        mustMatch: true,
        matchContains: false,
        scroll: true,
        scrollHeight: 220,
        selectFirst: false,

   extraParams: {
       fromcontinent: function() { return $("#fromcontinent").val(); }
}