Get 'is null' error when using JQuery Adapter

Hi,

I'm very new to both CKEditor and JQuery so please excuse me if I'm missing something really basic! I'm trying to add CKEditor with the JQuery adapter to a JSP page and whenever I try and initialize the adpater I get an is null error. I have the following in the head of the file:

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.js"></script> 
<script type="text/javascript" src="/secure/ckeditor/ckeditor.js"></script>
<script type="text/javascript" src="/secure/ckeditor/adapters/jquery.js"></script>

   <script type="text/javascript">
   //<![CDATA[

$(function()
{
   var config = {
      toolbar:
      [
         ['Bold', 'Italic', '-', 'NumberedList', 'BulletedList', '-', 'Link', 'Unlink'],
         ['UIColor']
      ]
   };

   // Initialize the editor.
   // Callback function can be passed and executed after full instance creation.
   $('.jquery_ckeditor').ckeditor(config);
});

   //]]>
   </script>