Using pre-made script to pause Mouselook X axis not pausing

I read about a refined Pause Script here: http://answers.unity3d.com/questions/60236/how-can-i-pause-the-mouse-look-script-when-i-pause.html

and managed to implement it into my game (First game with Unity might I add) and it works great except for one problem. I can access the MouseLook that affects the Y axis, and set it on and off, but I can't seem to do the same for the X axis version, I keep receiving a Null Pointer Error. If I uncomment any of the three lines commented out, I receive that error and the Y axis doesn't get paused as well at that point. If I comment it out, the Y axis pauses alone.

Here's the rest of the code if you want to see it for reference:

http://pastebin.com/jkUu3R98

 function PauseGame() 
 {    
     savedTimeScale = Time.timeScale;
     doPauseWindow = true;
     Time.timeScale = 0;
     AudioListener.pause = true;
     //firstPersonControllerCamera = gameObject.Find("First Person Controller").GetComponent("MouseLook");
     mainCamera = gameObject.Find("Main Camera").GetComponent("MouseLook");
     //firstPersonControllerCamera.enabled = false;
     mainCamera.enabled = false;
 
     
     if (pauseFilter) 
     {
         pauseFilter.enabled = true;
     }
 }
  
 function UnPauseGame() 
 {
     Time.timeScale = savedTimeScale;
     doPauseWindow = false;
     AudioListener.pause = false;
     //firstPersonControllerCamera.enabled = true;
     mainCamera.enabled = true;
     
     if (pauseFilter) 
     {
         pauseFilter.enabled = false;
     }
 }