Someone

<?phpfunction boxFilter($str) {	return preg_replace("/<h[1234]>(.*)<\/h[1234]>/i","<div class='empty'>		<div class='TopRight'> </div>		<div class='TopLeft'>  </div>		$0		<div class='BottomRight'> </div>		<div class='BottomRight'> </div>		</div>", $str);?>