coin collecting with onscreen score

var score = 0;
function OnTriggerEnter( other : Collider ) {    
   if (other.tag == "Coin") {        
      score += 5;        
      Destroy(other.gameObject);
   }
}

i use this code to collect coins, but cannot get it do display onscreen, i'm not a programmer, just a designer, so can advice a simple help? :)

function OnGUI()
{
    GUILayout.Label( "Score = " + score );
}

Put that in your script.