Double doors to open together

I have many door scripts that work very well if used on a single door, but how do I get them to work with two doors ( double doors) at the same time so both doors open together, or indeed slide open together at the same time.

Do i have to link them in a special way or is there a special script to do this.

Or a command sorry to add to my existing scripts.

Nisa, sending you a great free double door, it can also be found on slex
http://www.xstreetsl.com/modules.php?name=Marketplace&file=item&ItemID=370693

Somebody should tell all the builders out there. Almost every double door I see in these prefab stores has to be clicked twice to open ..

the modification I uses is to trigger the door open/close on received message instead of touch, then in touch broadcast the message. works well for both link messages and chat, but with either you have to be sure that the rest of the objects that can get the message filter it properly so that opening a door doesn't trigger something else.

ETA:
when using chat you must have the chat message coming from a different prim than the one listening for this method to work properly

I've made one prim double doors. May be too thin for your tastes. I'll send you one if my inventory loads.

Thank you all