Script for when you look at a cube, press the left click button, and it breaks it.

I want to make a script where when you look at a cube, you can press the left click button, that i named "Break"

function Update () {      
    if(GetAxis("Mouse Y")) {
        GetAxis("Mouse X");
        Destroy (gameObject);                

Since i'm new to Unity, can someone tell me, how if axis Mouse Y and Mouse X are on gameobject, it needs the break button to destroy the game object? I'm sorry if my codings REALLY different from what its suppose to be.

There are a couple ways you can approach this. The easy way would be to:

//This goes on your cube.
function OnMouseDown () {      

This will work as long as you have a collider on your cube. This function is called when the user clicks on your Collider.

You could also raycast from the camera and detroy the object that you hit:

//This goes on anything you want really.  Logic would say it goes on the camera though.
function Update () {
    if (Input.GetButton("Break")) {
        var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
        var hit : RaycastHit;
        if (Physics.Raycast (ray, hit, 100)) {