How to set onchange of two dropdown in JQuery & CodeIgniter -

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i'm using codeigniter , have question in setting onchange on 2 dropdown using jquery, here code :

<? function generateselect($name = '', $options = array(), $code) {     $html = '<select name="'.$name.' id="'.$name.'"">';     foreach ($options->result_array() $row) {         if ($row[$name] == $code) {         $html .= '<option value='.$row[$name].' selected>'.$row[$name].'</option>';         } else {         $html .= '<option value='.$row[$name].'>'.$row[$name].'</option>';         }     }     $html .= '</select>';     return $html; }  echo '<div id="actype"><table cellpadding=2 cellspacing=2 border=1><tr><td>ac type</td><td>'.generateselect('actype', $query_1, $actype).'</td>';  echo '<div id="acreg"><tr><td>ac reg</td><td>'.generateselect('acreg', $query_2, $acreg).'</td></div></table>'; ?>

and javascript:

<script type="text/javascript">       $(function() {            // navigate page on click event            $('#actype').bind('change', function() { gotopage(); } );       $('#acreg').bind('change', function() { gotopage(); } );       });         function gotopage() { location.href = 'http://localhost/camp/ci/index.php/blog/show_package/'+$("#actype :selected").val()+'/'+$("#acreg :selected").val(); }  </script>

so when first dropdown selected, page add uri segment. , based on segment, query run , list of second dropdown generated.

the problem when second dropdown selected, page adds "undefined" new segment. think page cannot fetch selected value of second dropdown.

please help.

there's " missing in line:

$html = '<select name="'.$name.'" id="'.$name.'"">';

also wise wrap value properties, like:

$html .= '<option value="'.$row[$name].'">'.$row[$name].'</option>';

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