Pause Menu select error

hi, I am building a game and the pause menu is almost working. the only issue is that that GUI buttons are only selectable with the right mouse button, and I obviously want the left. My other idea was to just have buttons on the keyboard be used to load that levels, etc. here is the script that I'm using:

var mainMenuSceneName : String; var pauseMenuFont : Font; private var pauseEnabled = false;
var GameObject; var parentObject;

function Start(){ pauseEnabled = false; Time.timeScale = 1; AudioListener.volume = 1; Screen.showCursor = false;

}

function Update(){

 //check if pause button (escape key) is pressed
 if(Input.GetKeyDown("escape")){
 
     //check if game is already paused        
     if(pauseEnabled == true){
         //unpause the game
         pauseEnabled = false;
         Time.timeScale = 1;
         AudioListener.volume = 1;
         Screen.lockCursor = true;
         Screen.showCursor = false;
         GetComponent(MouseLook).enabled = !GetComponent(MouseLook).enabled;
         
     }
     
     //else if game isn't paused, then pause it
     else if(pauseEnabled == false){
         pauseEnabled = true;
         AudioListener.volume = 0;
         Time.timeScale = 0;
         Screen.lockCursor = false;
         Screen.showCursor = true;
         GetComponent(MouseLook).enabled = !GetComponent(MouseLook).enabled;
                      
     }
 }

}

private var showGraphicsDropDown = false;

function OnGUI(){

GUI.skin.box.font = pauseMenuFont; GUI.skin.button.font = pauseMenuFont;

 if(pauseEnabled == true){
     
     //GetComponent(MouseLook).enabled = false;
     //Make a background box
     GUI.Box(Rect(Screen.width /2 - 100,Screen.height /2 - 150,250,200), "PAUSED");
     
     //Make Main Menu button
     if(GUI.Button(Rect(Screen.width /2 - 100,Screen.height /2 - 50,250,50), "Main Menu")){
         Application.LoadLevel("mainmenu");
         Screen.lockCursor = false;
         Screen.showCursor = true;
     }
     
     //Make Restart Level Button <---This is all me!!!!!!!!  (Stuible)
     if(GUI.Button(Rect(Screen.width /2 - 100,Screen.height /2 - 100,250,50), "Restart Level")){
         Application.LoadLevel("casa de muerta");
         ScoreScript.Counter = 0;
         Screen.lockCursor = false;
         Screen.showCursor = true;
     }
     
     //Make Change Graphics Quality button
         if(GUI.Button(Rect(Screen.width /2 - 100,Screen.height /2 ,250,50), "Change Graphics Quality")){
         
         if(showGraphicsDropDown == false){
             showGraphicsDropDown = true;
             Screen.lockCursor = false;
             Screen.showCursor = true;
         }
         else{
             showGraphicsDropDown = false;
         }
     }
     
     //Create the Graphics settings buttons, these won't show automatically, they will be called when
     //the user clicks on the "Change Graphics Quality" Button, and then dissapear when they click
     //on it again....
     if(showGraphicsDropDown == true){
         if(GUI.Button(Rect(Screen.width /2 + 150,Screen.height /2 ,250,50), "Fastest")){
             QualitySettings.currentLevel = QualityLevel.Fastest;
             Screen.lockCursor = false;
             Screen.showCursor = true;
         }
         if(GUI.Button(Rect(Screen.width /2 + 150,Screen.height /2 + 50,250,50), "Fast")){
             QualitySettings.currentLevel = QualityLevel.Fast;
             Screen.lockCursor = false;
             Screen.showCursor = true;
         }
         if(GUI.Button(Rect(Screen.width /2 + 150,Screen.height /2 + 100,250,50), "Simple")){
             QualitySettings.currentLevel = QualityLevel.Simple;
             Screen.lockCursor = false;
             Screen.showCursor = true;
         }
         if(GUI.Button(Rect(Screen.width /2 + 150,Screen.height /2 + 150,250,50), "Good")){
             QualitySettings.currentLevel = QualityLevel.Good;
             Screen.lockCursor = false;
             Screen.showCursor = true;
         }
         if(GUI.Button(Rect(Screen.width /2 + 150,Screen.height /2 + 200,250,50), "Beautiful")){
             QualitySettings.currentLevel = QualityLevel.Beautiful;
             Screen.lockCursor = false;
             Screen.showCursor = true;
         }
         if(GUI.Button(Rect(Screen.width /2 + 150,Screen.height /2 + 250,250,50), "Fantastic")){
             QualitySettings.currentLevel = QualityLevel.Fantastic;
             Screen.lockCursor = false;
             Screen.showCursor = true;
         }
         
         if(Input.GetKeyDown("escape")){
             showGraphicsDropDown = false;
         }
     }
     
     //Make quit game button
     if (GUI.Button (Rect (Screen.width /2 - 100,Screen.height /2 + 50,250,50), "Quit Game")){
         Application.Quit();
     }
 }

}