help: how to getting data with java?

hi
i'm using ckeditor 3.x and when i try to get content with php it will work simply
bu when i try to get content with javascript it wont work
here is my code:

function adding() {
   var newstitle = document.getElementById('newstitle').value;
    var exp = document.getElementById('editor').value;
   getData('ajaxphpfiles/loader.php','output','newstitle='+ newstitle +'&exp='+ exp +'&mode=add')
}

and my ckeditor is linked this way :

<textarea class="textarea" cols="80" id="editor" name="exp" rows="10"></textarea>
               <script type="text/javascript">
               CKEDITOR.replace( 'editor' );
               </script>

how can i get the comments posted by users with javascript?
i'm planning to use ajax instead of old ways.
thanks for your concern.