Problem with CKEditor and jQuery $post()

Hi

When I submit the form, I don't get the value of the ckeditor textarea field by posting it with the jQuery AJAX function $post()... (only firefox, IE > 7 seems to work).

jQuery function:

<script type="text/javascript">
$(document).ready(function(){
   $('#formnews').submit(function(){
      var f = $('#formnews');
      var action = f.attr('action');
          var serializedForm = f.serialize();
         $.post(action,serializedForm,function(data){
         if(data > 0) {
            var page = 'inc/newsdetail.php?id='+data;
            openList('inc/browserlist.php?typ=news');
            openFile(page);
         }   
         else {
            $("#form_error").html("<div class='error_text'>Bitte Titel und Text eingeben!</div>");
         }
      });
      return false;
   });
});  
</script>

Thanx for your help!