Activating a Script By Pressing TAB

Hey, so I need to know how to make a script, to activate another script (script-ception?).
The idea is that when the player presses tab, another script (which is toggled off), gets toggled On. Later, when the player hits tab again, the script deactivates. (It’s a pause menu, if you have’t already figured it out.)
It’d be cool if we could make the script a variable that I can change if I wanted to have multiple scripts.
Thanks

Okay, lets make it simple ok?

C#:

public bool isPaused = false;

void Update(){
if(Input.GetButton(KeyCode.Tab){
PauseGame();
}
}

public void PauseGame(){
isPaused = !isPaused;
//some more velocity/force pause modes.
}

I think this will do what you want.

public bool isPaused = false;

void Update()
{
if (Input.GetButtonDown(KeyCode.Tab)&&!isPaused)
{
isPaused = true;
gameObject.GetComponent<Script>().enabled = true;
}

if (Input.GetButtonDown(KeyCode.Tab)&&isPaused)
{
isPaused = false;
gameObject.GetComponent<Script>().enabled = false;
}
}

A more simple approach, have it all in one script?

  void Update()
{
    if(Input.GetKeyDown(KeyCode.P))
    		{
    			pauseMenu = true;
    			Time.timeScale = 0; //this sets the time to 0 and pauses the game
    		}
}
    void OnGUI()
    {
    if (pauseMenu) 
    		{
    			if (GUI.Button (new Rect (0,0,20,20), "Return to Game")) 
    			{
    				pauseMenu = false;
    				Time.timeScale = 1; //this continues the game
    			}
    }