google map api ข้อความที่ดึงจากฐานข้อมูลพอปิดแล้วไม่แสดงอีก

<? while($rec=mysql_fetch_array($result))
			{ 
		?>   
			myCenter=new google.maps.LatLng("<? echo $rec[case_lat] ?>","<? echo $rec[case_lng] ?>");

			marker=new google.maps.Marker({
			position:myCenter,
			animation: google.maps.Animation.DROP,
				 });

		info = new google.maps.InfoWindow({
		content: '<?=$rec[case_name]?>'
		});

		info.open(map, marker);
		marker.setMap(map);

		google.maps.event.addListener(marker, "click", function() {
		info.open(map, marker);
			});
	   <? } ?>