Utilisation de JQuery pour définir la valeur CKEDITOR

J'ai un textarea CKeditor:

function (obj) {
      $.ajax({
         type: "POST",
          url: "ContentSections.aspx/GetContentDetails",
          data: '{"nodeID": "' + obj.attr('id') + '"}',
          contentType: "application/json; charset=utf-8",
          dataType: "json",
          success: function (msg) {
             var str = msg.d;
             var substr = str.split('|||');

             $('#ContentPlaceHolder_hfContentSectionID').val(substr[0]);
             $('.txtAlias').val(substr[1]);
             $('.txtBrowserTitle').val(substr[2]);
             $('.txtMetaDescription').val(substr[3]);
             $('.txtMetaKeywords').val(substr[4]);
             $('#ContentPlaceHolder_taBody').val(substr[5]);
          }
     });
}