Pause Menu background problem

I've got a little problem with my Pause menu, and i dont know how to solve it.. The background keeps being the "Top layer", so that you are unable to read the text (The background is a picture). And I'm clueless about how i can fix it.

 #pragma strict
 
 private var pauseEnabled = false;    
 var guiOn : boolean;
 var frameStyle : GUIStyle;
 var buttonSizeRestart : Rect = Rect(0,0,0,0);
 var buttonSizeQuit : Rect = Rect(0,0,0,0);
 var buttonSizeMainMenu : Rect = Rect(0,0,0,0);
 var buttonSizeBackground : Rect = Rect(0,0,0,0);
 var buttonTextRestart : String;
 var buttonTextQuit : String;
 var buttonTextMainMenu : String;
 var backgroundStyle : GUIStyle;
 
 function Start () {
     pauseEnabled = false;
     Screen.showCursor = true;
 }
  
 function Update () {
 
        if(Input.GetKeyDown("escape")){
                if(pauseEnabled == true){
                pauseEnabled = false;
             Time.timeScale = 1;
             }
         else if(pauseEnabled == false){
             pauseEnabled = true;
             Time.timeScale = 0;
             }
         }
         
     if (Input.GetKeyDown(KeyCode.Escape )){
         if(guiOn){
         guiOn=false;
         }
         else{
     
         guiOn=true;
         }
     }
 }
  
 function OnGUI(){
 
 if(pauseEnabled == true){
 
         if(GUI.Button(buttonSizeRestart,buttonTextRestart,frameStyle)){
             Application.LoadLevel("Restart");
         }
     
         if(GUI.Button(buttonSizeQuit,buttonTextQuit,frameStyle)){
             Application.Quit();
         }
     
         if(GUI.Button(buttonSizeMainMenu,buttonTextMainMenu,frameStyle)){
             Application.LoadLevel("Main Menu");
         }
 }
 
 if (guiOn){
 
         if(GUI.Button (buttonSizeBackground,"",backgroundStyle));
     
     }
 
 }

Here is the background: (Its just a Transparent dark background, so that you focus the text)

[1]: /storage/temp/16603-pause+background.png