/* Define two custom functions (asc and desc) for string sorting */
jQuery.fn.dataTableExt.oSort['string-case-asc']  = function(x,y) {
	return ((x < y) ? -1 : ((x > y) ?  1 : 0));
};

jQuery.fn.dataTableExt.oSort['string-case-desc'] = function(x,y) {
	return ((x < y) ?  1 : ((x > y) ? -1 : 0));
};

$(document).ready(function() {
	/* Build the DataTable with third column using our custom sort functions */
	$('#example').dataTable( {
		"aaSorting": [ [0,'asc'], [1,'asc'] ],
		"aoColumns": [
			null,
			null,
			{ "sType": 'string-case' },
			null,
			null
		]
	} );
} );