Reusing the instance of CKEditor in the Jqeury UI Dialog

Hi,

First I create an instance of CKEditor named 'richEditor' in a webPage .Then by an ajax call I am  opening a jquery dialog and  using   'richEditor'  instance in the  dialog by copying the HTML content and then pasting it in a div in the dialog.

But the reused 'richEditor'  instance does not  work.Any button click in the editor is throwing javascript error and neither the textarea nor the source text area is editable.

Any help or thought is really  appreciated.