Accessing a variable in another script?

Hello. In this script I am defining a variable for the score multiplier in my game

var Mul = 1;
function OnTriggerEnter (other : Collider) {

    if (other.gameObject.CompareTag ("Mul")) {
        Destroy (other.gameObject);
        Mul += 1;
    }
}

In this script I am defining the variable for the game's score. I want to make it so that the score increases by 100*the "Mul" variable, but it wont call the variable from the other script(it just calls the one thats already in the script). How do I call a variable from another script?

static var Score = 0;
var Mul = 1;
function OnTriggerEnter (other : Collider) {
    if (other.gameObject.CompareTag ("Enemy")) {
        Destroy (gameObject);
        Destroy (other.gameObject);

        Score += 100*Mul;
    }

}

try to do the variable mul static and in the other script put before the name of the script that you have the variable mul then you put a period and then the variable of mul

Note: the name of the script has to be without a space.