No esc when game over.

So I got a nice press esc to pause the game. And you can get out of time (game over) But when you are game over you can still press esc. I tried something with a noEsc but it didn't work.

Anyone can help me out?

 **My pause script**
 
 var isPaused : boolean = false;
 
 function Update () {
     if(Input.GetKeyDown("escape") && !isPaused){
         Time.timeScale = 0.0;
         isPaused = true;
     }
     else if (Input.GetKeyDown("escape") && isPaused){
         Time.timeScale = 1.0;
         isPaused = false;
     }
 }
 
 function OnGUI () {
     if(isPaused){
         GUI.Box (Rect (490,250,300,160), "game menu");
         if(GUI.Button (Rect (590,310,100,20), "restart")){
             //ResetVariables();
             Application.LoadLevel("level9");
             Time.timeScale = 1.0;
             isPaused = false;
         }
         if(GUI.Button (Rect (590,340,100,20), "continue")){
             Time.timeScale = 1.0;
             isPaused = false;
         }
         if(GUI.Button (Rect (590,370,100,20), "back to menu")){
             Application.LoadLevel("menu");
         }
         GUI.Label (Rect (260,280,242,100), "\t\t\t\t");
     }
 }
 
 @script AddComponentMenu ("GUI/Pause GUI")
 //function ResetVariables()
 //{
 //    gameOver.noEsc = false;
 //}
 
 
 
 **And my game over script**
 
 var timerValue: float = 5; //You can change this in the inspector.
 var myTimer: float;
 
 //var noEsc = false;
 
 //var GuiButtonStyle : GUIStyle;
 //var GuiBoxStyle : GUIStyle;
 
 var timerOutput: GUIText;
 var timeIsUp = false; 
 
 function Start(){
     Time.timeScale = 1.0;
 }
 
 function Awake(){
     myTimer = timerValue;
 }
 
 function Update(){
     if(myTimer > 0){
         myTimer -= Time.deltaTime; 
         var seconds: int = myTimer % 60; 
           var minutes: int = myTimer / 60; 
           timerOutput.text = minutes + ":" + seconds;
     }    
     if(myTimer <= 0){
         timeIsUp = true;
         Time.timeScale = 0.0;
     }
 
 }
 
 function OnGUI(){
     if(timeIsUp == true){    
         GUI.Box (Rect (490,250,300,160), "Game over"/*, GuiBoxStyle*/);
         if(GUI.Button (Rect (590,310,100,20), "restart"/*, GuiButtonStyle*/)){
             //noEsc = true;
             Application.LoadLevel("level9");
             resetTheVariables();
             myTimer = timerValue;
         }
         if(GUI.Button (Rect (590,340,100,20), "menu"/*, GuiButtonStyle*/)){
             resetTheVariables();
             Application.LoadLevel("menu");
         }
     }
 }
 
 @script AddComponentMenu ("GUI/Pause GUI")
 
 function resetTheVariables(){
 //    noEsc = false;
 }