JQuery AutoComplete suggession box showing previous record while change country

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I have used automplete by using php code.I need to show my zip code by country wise. But my oldcountry zip code is showing.while i changing the first country to other country.plz help me. :( :( :( :( :( :(

$(function() {
           var pageUrl = document.getElementById('pageurl').value;
           $('#zip_business').autocomplete({
               serviceUrl: pageUrl + "businesses/ajax.php",
               extraParams: {
                   country: function() {
                       return $('#country').val();
                   }
               }
           });
       });

ajax.php

$sqlData = mysql_query("SELECT * FROM zipcodes WHERE zip LIKE '".$_REQUEST['q']."%' AND country='".$_REQUEST['country']."'");
$values = '';
while ($getData = mysql_fetch_array($sqlData)) {
      $values.=$getData['zip'] . "," . $getData['full_state'] . "," . $getData['city'] . "|" . $getData['zip'] . "\n";
}
echo $values;