help with xajax examples for codeigniter

Code:
&lt;?php

Class Searching Extends Controller {

                    

function Searching()    {

    //ini_set('display_errors', 'On');

    parent::controller();

    $this->load->library('xajax');

    $this->xajax->registerFunction(array('getCities',&$this,'getCities'));

    $this->xajax->processRequest();

    }



function getCities($sSearch)  {

  $aCities = array(

                    "AaenHunze",

                    "Aalburg",

                    "Aalsmeer",

                    "Aalten",

                    "Abcoude",

                    "Achtkarspelen",

                    "Alblasserdam",

                    "Albrandswaard",

                    "Alkemade");

  $sOut = "";

  $nCount = 0;

  foreach($aCities as $sCity)  {

    $sPattern = "/^(".strtolower($sSearch).")/"; 

    if(preg_match($sPattern, strtolower($sCity)))  {

        $nCount++;

        $sOut .= "<li></li>";

        $sLastHit = $sCity;

      }

  }

  if($nCount > 31)  {

    $sOut = "";

    }

    $objResponse = new xajaxResponse();

  if(strlen($sOut) > 0)  {

    $sOut = "<ul>".$sOut."</ul>";

    $objResponse->addScript("document.getElementById('citybox').style.display = \"block\"");

  }

  else  {

    $objResponse->addScript("document.getElementById('citybox').style.display = \"none\"");

  }

if($nCount == 1)  {

    $objResponse->addScript("document.getElementById('citybox').style.display = \"none\"");

    $objResponse->addScript("document.getElementById('search').value = \"".$sLastHit."\"");

  }

    $objResponse->addAssign("citybox", "innerHTML", $sOut);  

    return $objResponse->getXML();

}



function index() {

    $template['head'] = $this->xajax->printJavascript();

    $template['xajax_js'] = $this->xajax->getJavascript(base_url() . "demo");

    $template['content'] = "&lt;input autocomplete=\"off\" type=\"text\" class=\"textbox\" name=\"search\" value=\"\" id=\"search\" onkeyup=\"xajax_getCities(document.getElementById('search').value);\"/&gt;<br />";

    $template['citybox_content'] = '<div id="citybox">&nbsp;</div>';

    $this->load->view('searching_view', $template);



    }



}

?&gt;