Collecting x amount of items triggers event?

So, i have a points and pick up script, the things collected have the tag of Coins. When i collect x amount of coins i want to trigger an event such as when character collects 10 'coins', the wall of cubes disappears? I have no idea how to do this.

My pick up code is:

var score = 0;
var scoreText = "Score: 0";
var mySkin : GUISkin;

function OnTriggerEnter( other : Collider )
{
Debug.Log("OnTriggerEnter() was called");
if (other.tag == "Coin")

{
Debug.Log("Other object is a coin");
score += 1;
scoreText = "Score: " + score;
Debug.Log("Score is now " + score);
Destroy(other.gameObject);
}
else
{
score +=5;
scoreText = "Score: " + score;
Debug.Log("Score is now " +score);
Destroy(other.gameObject);
}
}

function OnGUI () {
GUI.skin = mySkin;
GUI.Label (Rect (10, 10, 500, 200), scoreText.ToString()); }

You must have a function to "pick up a coin". By your "points" I assume that every time a coin is picked up a point is added.

So in your function which "adds a point" you would want to do a check to see how many total points the player has. In this code I'm assuming your player coin count is a var called "playerCoins":

function pickUpCoin()
{
  //all your coin picking up code
  if (playerCoins == 10)
     {
       DoSomething(); //call the function to do something (destroy wall etc)
     }
}

If you want something more in depth then edit the question and add your current code.

EDIT:

    function OnTriggerEnter( other : Collider )
    {
    Debug.Log("OnTriggerEnter() was called");
    if (other.tag == "Coin")

    {
    Debug.Log("Other object is a coin");
    score += 1;
    scoreText = "Score: " + score;
    Debug.Log("Score is now " + score);
    Destroy(other.gameObject);
    }
    else
    {
    score +=5;
    scoreText = "Score: " + score;
    Debug.Log("Score is now " +score);
    Destroy(other.gameObject);
    }

if (score >= 10)
{
//do something
}
    }

Place the score check at the end of your OnTriggerEnter function, and set the object you'd like to destroy in the inspector.

var wall : GameObject;

// Check if over X amount and if so destroy the object set as 'wall'
if(score >= 10)
    Destroy(wall);