need help with collition script

Unity Engine
1 
#pragma strict

var health : int = 100;
var speed : int = 5;
var collided_with : GameObject;
function Start () {

}

function Update () {

if(Input.GetAxis("Horizontal") >0 ){
   if (collided_with.tag == "left"){
       return;
   }
    transform.Translate(Vector3(1 * speed * Time.deltaTime,0,0));
  }
  
  if(Input.GetAxis("Horizontal") <0){
   if (collided_with.tag == "right"){
       return;
   }
    transform.Translate(Vector3(-1 * speed * Time.deltaTime,0,0));
  }
  
 
  
  
  
}

function OnCollitionInter(col : Collision ){

collided_with = col.gameObject;



}
2

You need to spell the name correctly.

function OnCollisionEnter(col : Collision)

NOT

function OnCollitionInter(col : Collision ){