code: protected void closeColSpanDiv(ResponseWriter rw, String span) throws IOException {
          if (span != null && span.trim().length() > 0) {
              rw.endElement("div");
          }
  	}
docs: Terminate the column span div (if there's one). This method is protected
  in order to allow third-party frameworks to derive from it.
  
  @param rw
  the response writer
  @param span
  the width of the components (in BS columns).
  @throws IOException
  may be thrown by the response writer