accessing a variable from another script.

I am very new to programming and struggling with a problem. I am trying to access the variable “score” from one script and use “score” to determine the height of a guitexture on another script. I have tried it a couple ways but i keep getting this error: Null Reference Exception: Object reference not set to an instance of an object.
This is how my script is written.

//this is my first script, which is named: stonyScript

var score : float = 0;

function OnCollisionEnter(col : Collision){

if(col.gameObject.name == ("asteroid")){
	score += 10;
}

//here is the second script.

currentHeight = stonyScript.js.score;

function Update(){

guiTexture.pixelInset.width = 20;

guiTexture.pixelInset.height = 10 + currentHeight;

}

You have to tell it where to get stonyScript from.

stonyScript = GameObject.Find("Insert the name of the object that stonyScript is located").GetComponent(stonyScript);
currentHeight = stonyScript.score

I gave that a try but I am still getting the same error for some reason. Did i implement your method wrong?

stonyScript.js = GameObject.Find(“Stony”).GetComponent(stonyScript.js);

currentHeight = stonyScript.js.score

The easiest way I believe is to just make your variables public static if you want to easily access them.

for example:

Script #1 is called PlayerMoveScript and contains:

public static int playerHealth = 10;

You can access this variable from any other script by using:

PlayerMoveScript.playerHealth += 1;

or:

int newPlayerHealth;

newPlayerHealth = PlayerMoveScript.playerHealth;