Audio track based on integer value. (integer value changed by GUI.Button)

I want to have three buttons that each when selected change the current audio track to track one, track two, and track three respectively. To do this, I defined a var for each of the audio sources along with defining an integer called SelectedTrack in order to make it so by clicking on a button the integer would be set to a value of 1,2, or 3 and that if SelectedTrack=1 then track one would play and so on for track two and three.

This is the code that I have right now for my GUI setup:

var PauseWallpaper : GUISkin;
var TrackOne : AudioSource;
var TrackTwo : AudioSource;
var TrackThree : AudioSource;
var SelectedTrack : Int = 1;
static var ToggleMenu : boolean = false;
function Update()
{
    if(Input.GetKeyDown(KeyCode.Escape)){
        GetComponent("MouseLook").enabled = !GetComponent("MouseLook").enabled;
        GetComponent("Camera").enabled = !GetComponent("Camera").enabled;
        PauseGame();
        }
    if(SelectedTrack=1){
    audio.Play(TrackOne);
    }
    if(SelctedTrack=2){
    audio.Play(TrackTwo);
    }
    if(SelctedTrack=3){
    audio.Play(TrackThree);
    }
}

static function PauseGame()
{ 
    if(!ToggleMenu)
    {
        Time.timeScale=0;
        AudioListener.pause = true;
        ToggleMenu=true;
    }
    else
    {
        Time.timeScale=1;
        AudioListener.pause = false;
        ToggleMenu=false;
    }
}

function OnGUI()
{
    if(GUI.Button(Rect(0,0,100,50),"Track One")){
    SelectedTrack = 1;
    }
    if(GUI.Button(Rect(0,0,100,50),"Track Two")){
    SelectedTrack = 2;
    }
    if(GUI.Button(Rect(0,0,100,50),"Track Three")){
    SelectedTrack = 3;
    }
    if(ToggleMenu) //if ToggleMenu = true execute follwing.
    {
        GUI.skin = PauseWallpaper;
        GUI.Box(Rect (0,0,Screen.width,Screen.height), "PAUSED");
        if(GUI.Button(Rect (Screen.width / 2 - 50, Screen.height / 2 - 75, 100, 50), "Exit Program")){
            Application.Quit();
        }
        if(GUI.Button(Rect (Screen.width / 2 - 50, Screen.height / 2 - 25, 100, 50), "Level Select")){
        //script
        }
    }
}

These are the errors that currently come up : (14,25): BCE0044: expecting ), found '='. (14,26): BCE0043: Unexpected token: 1. (15,29): BCE0044: expecting :, found ';'.

Lines 43 to 51 is where I want to change the integer value when each button is pressed. and 14 to 22 is where I want the current track playing to be based off of the integer value.

Any help figuring this out is greatly appreciated.

if you use if(...), you should use the == , example - if (SelectedTrack == 1){ your script in here ... }

And play other audio , you should use the AudioChip and audio.PlayOneShot,

example - var TrackOne : AudioChip;

audio.PlayOneShot(TrackOne);

var PauseWallpaper : GUISkin;

// Put your audio clip in the TrackOne, TrackTwo and TrackThree, but not the audio source

var TrackOne : AudioClip;

var TrackTwo : AudioClip;

var TrackThree : AudioClip;

var SelectedTrack : Int = 1;

static var ToggleMenu : boolean = false;

function Update()
{
    if(Input.GetKeyDown(KeyCode.Escape))
    {
        GetComponent("MouseLook").enabled = !GetComponent("MouseLook").enabled;
        GetComponent("Camera").enabled = !GetComponent("Camera").enabled;
        PauseGame();
    }

    if(SelectedTrack == 1)
    {
        audio.PlayOneShot(TrackOne);
    }

    if(SelectedTrack == 2)
    {
        audio.PlayOneShot(TrackTwo);
    }

    if(SelectedTrack == 3)
    {
        audio.PlayOneShot(TrackThree);
    }
}

static function PauseGame()
{ 
    if(!ToggleMenu)
    {
        Time.timeScale=0;
        AudioListener.pause = true;
        ToggleMenu=true;
    }
    else
    {
        Time.timeScale=1;
        AudioListener.pause = false;
        ToggleMenu=false;
    }
}

function OnGUI()
{
    if(GUI.Button(Rect(0,0,100,50),"Track One"))
    {
        SelectedTrack = 1;
    }

    if(GUI.Button(Rect(0,0,100,50),"Track Two"))
    {
        SelectedTrack = 2;
    }

    if(GUI.Button(Rect(0,0,100,50),"Track Three"))
    {
        SelectedTrack = 3;
    }

    if(ToggleMenu) //if ToggleMenu = true execute follwing.
    {
        GUI.skin = PauseWallpaper;

        GUI.Box(Rect (0,0,Screen.width,Screen.height), "PAUSED");

        if(GUI.Button(Rect (Screen.width / 2 - 50, Screen.height / 2 - 75, 100, 50),    "Exit Program"))
            Application.Quit();

        if(GUI.Button(Rect (Screen.width / 2 - 50, Screen.height / 2 - 25, 100, 50), "Level Select"))
        {
            //script
        }
    }
}

There are some script reference - AudioClip and PlayOneShot