Javascript post data from child window to parent window

I have a page that opens a child window.  The user submits data into a form field in the child window and then clicks the submit button, which updates the parent textarea from the child window.

However since installing ckeditor this no longer works.  
Does anybody know how I could accomplish this using ckeditor.

Below is my current child window code javascript code.

<script language="Javascript" type="text/javascript">
    window.focus();

   // update parent window
   function updateParent() {
      var r = myform.reason.value;
      opener.document.getElementById("notes").value = "Reason: " + r;
   window.close();
   }