[Unity3D] Menu Pause

#pragma strict

var largura = Screen.width/4;
var altura = Screen.height/4;

function Start () {
    Screen.showCursor = false;
}
function Update () {
    if(Input.GetKeyDown(KeyCode.Escape)) {
        doPauseToggle();
    }
}
function OnGUI() {
    if(Time.timeScale == 0) {
        GUI.Box(Rect(largura,altura,largura*6,altura*4),"Pause Menu");
    }
}
function doPauseToggle() {
    if(Time.timeScale > 0) {
        Time.timeScale = 0;
        Screen.showCursor = true;
    }
    else {
        Time.timeScale = 1;
        Screen.showCursor = false;
    }
}