public function addPreserveText($text, $styleFont = null, $styleParagraph = null) {
		if($this->_insideOf == 'footer' || $this->_insideOf == 'header') {
			$ptext = new PHPWord_Section_Footer_PreserveText($text, $styleFont, $styleParagraph);
			$this->_elementCollection[] = $ptext;
			return $ptext;
		} else {
			trigger_error('addPreserveText only supported in footer/header.');
		}
	}