CKEditor stop escaping inside htmlFilter

Hello girls & guys,

I try to replace a certain tag with another. Problem is the injected code is escaped.
The question is now how can I stop CKEditor from escaping my injected code, or maybe work around?

I inject the code via the following code:

afterInit : function( editor )  {
 var dataProcessor = editor.dataProcessor;
 htmlFilter = dataProcessor && dataProcessor.htmlFilter;

 if ( htmlFilter ) {
   htmlFilter.addRules( {
     elements : {
       $ : function( element ) {
         element.children[0].value =
           '<script language="JavaScript" type="text/javascript">\n' + 
           '        $(document).ready(function() { .. } );\n' +
           '</script>\n';
         }
       }
    });
  }
}

The injected code "before" transformation

<script language="JavaScript" type="text/javascript">
  $(document).ready(function() { .. });
</script>

But sadly the result is "only"

&lt;script language=&quot;JavaScript&quot; type=&quot;text/javascript&quot;&gt;
        $(document).ready(function() { .. });
&lt;/script&gt;

Thanks for reading,
-lony