Trying to make simple trigger score counter, having troubles.

I am trying to make my score go up up by one whenever it collides with a trigger, I have looked around a lot (I am aware of the extensive resources on this topic) but nothing seems to work. Clearly i'm quite terrible at programming so all help is appreciated.

This is the script I attached to an Invisible cube that is a trigger.

var currentScore : int = 0;

function OnTriggerEnter (other : Collider)

 {
     currentScore = currentScore + 1;
 }