(F)ckeditor inside innerhtml

Im using ckeditor (however the same happened with FCKEditor and TinyMCE),

I have an ajax administration area (http://webforma.co.uk/schools) and everything works fine. The pages load via innerHTML and the Add news (Home -> News -> Add) should be replacing the two textareas with CKEditors. However this doesn't happen even though the code is perfect and there are no clashes/errors. It works fine on a static page if there is no innerHTML (http://webforma.co.uk/schools/addtest.php) it works perfect.

Can anyone help me on how to prevent this clash?

Thanks!!!!!!!