This way:


When you use this, it goes like this: The door is closed, and when you walk closer it will automattically open, and when you passed it it will close again.
In that screenshot I used the set "Plastic Fortress" by Cmdr Dats, but you can use all sets, as long as they support doors.
In the animation: The first tile is the door if it's closed, the second if it's open.
You need an updated JCS.ini. Download it at Overords site: http://www.geocities.com/atlastsome.