Start Camera Lerp from diffrent script?

I have created a lerp script and placed it on my camera. and its working when i slide it in the inspector.

when the player mouseUP on an object i want the script that is on the camera to move from point a to b.

how do i tell one script to start the lerp? ugh. im confused.

here is the script i put on the camera

using UnityEngine;
using System.Collections;

public class Camera2 : MonoBehaviour {
private Vector3 Begin_Rotation = new Vector3(0f,0f,0f);
private Vector3 End_Rotation =  new Vector3(0f,0f,0f);
public Transform Start_Position;
public Transform End_Position;
public bool LerpIt = true;
float speed = 0.5f;
public bool TimeLerp = true;
public float Lerp_Slider = 0.0f;
private float timer = 0.0f;

	// Use this for initialization
	void Start () {

	// Update is called once per frame
	public void Update () {
			transform.position = Vector3.Lerp(Start_Position.transform.position,End_Position.transform.position, Lerp_Slider);
			//resets timer
			timer = 0;
		if (TimeLerp)
			timer += Time.deltaTime;
			transform.eulerAngles = Vector3.Lerp(Begin_Rotation, End_Rotation, timer*speed);

Create a public function in your Camera script which sets the LerpIt flag to true. This can then be called from any other script but updates the Camera script. Below I’ve included some pseudo-code to demonstrate.

void BeginLerp()
    LerpIt = true;

public class SomeOtherClass
    void Update()
        // Insert logic here