Script autodestruct code

I have a script that runs when the object is in the wear position on an avatar. When the AV returns the object to her/his inventory, I would like the script in it to self destruct and not play again in that object, or have the object disappear or die, if the AV tries to Rez it again. Can something along this line be done in SL, and if so is there code to insert in the script to get this to happen? If anyone has such code, I would appreciate a copy. Thanks.