Problem while using DataTables individual column filtering example (using select menus)

No matter what I do the select menu wont appear. I'm using the below code. Please help.


(function ($) {
/*
* Function: fnGetColumnData
* Purpose: Return an array of table values from a particular column.
* Returns: array string: 1d data array
* Inputs: object:oSettings - dataTable settings object. This is always the last argument past to the function
* int:iColumn - the id of the column to extract the data from
* bool:bUnique - optional - if set to false duplicated values are not filtered out
* bool:bFiltered - optional - if set to false all the table data is used (not only the filtered)
* bool:bIgnoreEmpty - optional - if set to false empty values are not filtered from the result array
* Author: Benedikt Forchhammer <b.forchhammer /AT\ mind2.de>
*/
$.fn.dataTableExt.oApi.fnGetColumnData = function (oSettings, iColumn, bUnique, bFiltered, bIgnoreEmpty) {
// check that we have a column id
if (typeof iColumn == "undefined") return new Array();

// by default we only want unique data
if (typeof bUnique == "undefined") bUnique = true;

// by default we do want to only look at filtered data
if (typeof bFiltered == "undefined") bFiltered = true;

// by default we do not want to include empty values
if (typeof bIgnoreEmpty == "undefined") bIgnoreEmpty = true;

// list of rows which we're going to loop through
var aiRows;

// use only filtered rows
if (bFiltered == true) aiRows = oSettings.aiDisplay;
// use all rows
else aiRows = oSettings.aiDisplayMaster; // all row numbers

// set up data array
var asResultData = new Array();

for (var i = 0, c = aiRows.length; i < c; i++) {
iRow = aiRows[i];
var aData = this.fnGetData(iRow);
var sValue = aData[iColumn];

// ignore empty values?
if (bIgnoreEmpty == true && sValue.length == 0) continue;

// ignore unique values?
else if (bUnique == true && jQuery.inArray(sValue, asResultData) > -1) continue;

// else push the value onto the result data array
else asResultData.push(sValue);
}

return asResultData;
}
}(jQuery));


function fnCreateSelect(aData) {
var r = '<select><option value=""></option>', i, iLen = aData.length;
for (i = 0 ; i < iLen ; i++) {
r += '<option value="' + aData[i] + '">' + aData[i] + '</option>';
}
return r + '</select>';
}


$(document).ready(function () {
/* Initialise the DataTable */
var oTable = $('#MainContent_GrdDistList').dataTable().columnFilter();

/* Add a select menu for each TH element in the table footer */
$("tfoot th").each(function (i) {
this.innerHTML = fnCreateSelect(oTable.fnGetColumnData(i));
$('select', this).change(function () {
oTable.fnFilter($(this).val(), i);
});
});
});