Need help loading the jquery class

Hey Guys,

I have added the following to my constructor method.

PHP Code:

     function __construct(){

         parent::__construct();

         $this->load->library('javascript/jquery');
     } 


But when I view the page I get the following error message

Severity: Error

Message: Class 'CI_Javascript' not found

Filename: javascript/Jquery.php

Line Number: 49

Backtrace:

Can someone please help me resolve this ? Thanks!