JS How to do something when a gameobject is destroyed ?

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Javascript

I want to increase or decrease a counter when a gameobject has been destroyed.

The code for destroying gameobject is linked to the gameobject which do the actions.
And the code allows me to increase or decrease a counter is in a separated code. It's necessary because I can't associate these two codes to the same gameobject.

Thus, I need to indicate that when a gameobject is destroyed, it's when we have to modificate the counter.

#pragma strict

var Counter : int = 0;


function Update () {

    Counter++;
    guiText.text = "Counter :"+Counter/80;


}

So, I just need the code which allows me to indicate : "gameobject is destroyed"

Thank you in advance for your help :)