problem with GUI errors and screen resolution

There are 2 problems i am having. 1. when i use my GUIText and set the resolution to screen.width and the screen.height, when i change the screen size bigger or smaller it does not adjust with the play area. 2. when i created the GUI's it gives me several errors(the red exclamation marks), but i am still able to play. below is the script and screen shots of the errors and the guiText. thanks for any assistance. this is in Jscript

sorry i tried to upload the screen shots but it did not work. the errors i was having said: UnityException: You are not allowed to call this function when declaring a variable. Move it to the line after without a variable declaration. If you are using C# don't use this function in the constructor or field initializers, Instead move initialization to the Awake or Start function. FlashLight..ctor () (at Assets/myScripts/FlashLight.js:74)

and.. get_guiText can only be called from the main thread. Constructors and field initializers will be executed from the loading thread when loading a scene. Don't use this function in the constructor or field initializers, instead move initialization code to the Awake or Start function.

then...

ArgumentException: get_guiText can only be called from the main thread. Constructors and field initializers will be executed from the loading thread when loading a scene. Don't use this function in the constructor or field initializers, instead move initialization code to the Awake or Start function. FlashLight..ctor () (at Assets/myScripts/FlashLight.js:74)

here is the script

 /*
 for 1st person shooter
 create an empty gameObject, name it FlashlightHolder and place it on the camera.
 inside the newly created empty Gameobject add a spot light and name it "flashlight" rotate as needed because it ussually is face down
 
 create a tag and name it " HeadLamp " make sure you follow the spelling and capitalizations.
 assign this script to the player.
 
 then create 3 GUI Text, found under  GameObject 
                                          create other 
                                                  GUI Text
                                                  
 name them:
     GUI Text_batteryLife
     GUI Text_batteryLifeRemaining_tex
     GUI Text_flashlight_statement
     
     all should be default positioned at:
         x 0.5
         y 0.5
         z 0
     
 in the "GUI Text_batteryLife" change the following:
         Text = 400
         
         Pixel offset 
         x = 0
         y = 0
         
         
         font size = 20
         
         all others can remain the same or change them how u see fit.
         
         
         
 in the " GUI Text_flashlight_statement " change the following:
 
         Text = TO Turn Flashlight On or Off, Press "O"
         
         Pixel offset 
         x = 0
         y =  0
         
         font size = 20
         
         
 in the " GUI Text_batteryLifeRemaining_tex " change the following
         Text = Battery Life Remaining
         
         Pixel offset
         x = 0
         y = 0
         
         font size = 20
 
 
 
 */
 
 
 
 
 #pragma strict
 var batteries: float = 2.0f;
 var batteryLife: float = 420.0f;
 var batteryReductionSpeed: float = 1.0f;
 
 var lightRange: float = 100.0f;
 
 var horizontalOffset01: float = 0.29f;
 var verticalOffset01: float = 0.47f;
 
 var horizontalOffset02: float = 0.37f;
 var verticalOffset02: float = 0.4f;
 
 var guiLifeOfBattery = guiText;
 var guiRemainingBatLife = guiText;
 var guiInstruction = guiText;
 
 
 
 
 function Awake () 
 {
     GameObject.FindWithTag("HeadLamp").light.enabled = false;
     batteries--;
     GameObject.Find("GUI Text_batteryLife").guiText.text = batteryLife.ToString();
     
     guiLifeOfBattery.enabled = false;
     guiRemainingBatLife.enabled = false;
     guiInstruction.enabled = true;
     
 //    guiLifeOfBattery.pixelOffset = Vector2(Screen.width * horizontalOffset02, Screen.height * verticalOffset02);
 //    guiRemainingBatLife.pixelOffset = Vector2(Screen.width * horizontalOffset01, Screen.height * verticalOffset01);
 }
 
 function Update () 
 {    
     if(GameObject.FindWithTag("HeadLamp").light.enabled == true)
     {
         guiLifeOfBattery.enabled = true;
         guiRemainingBatLife.enabled = true;
         guiInstruction.enabled = false;
     
         batteryLife = batteryLife -(batteryReductionSpeed * Time.deltaTime);
         GameObject.Find("GUI Text_batteryLife").guiText.text = batteryLife.ToString("#.");
         
         guiLifeOfBattery.pixelOffset = Vector2(Screen.width * horizontalOffset02, Screen.height * verticalOffset02);
         guiRemainingBatLife.pixelOffset = Vector2(Screen.width * horizontalOffset01, Screen.height * verticalOffset01);
         
     }
         if(Input.GetKeyDown("o") && !GameObject.FindWithTag("HeadLamp").light.enabled == true && batteries >= 0) 
         {
             if(batteryLife <= 0 && batteries > 0)
             {
                 batteries--;
                 batteryLife = 420;
                 lightRange = 100;
                 GameObject.FindWithTag("HeadLamp").light.range = lightRange;
                 
             }
             GameObject.FindWithTag("HeadLamp").light.enabled = true;
             
         }
         
         
         else if(Input.GetKeyDown("o") && GameObject.FindWithTag("HeadLamp").light.enabled == true || batteryLife == 0)
     {
         
         GameObject.FindWithTag("HeadLamp").light.enabled = false;
         guiInstruction.enabled = true;
     }
     if(batteryLife <= 0)
         {
             batteryLife = 0;
             GameObject.FindWithTag("HeadLamp").light.enabled = false;
             guiInstruction.enabled = true;
         }
         if(batteryLife <= 50)
         {
 
             GameObject.FindWithTag("HeadLamp").light.range = lightRange * batteryLife / 20;
             
             
                 if(batteryLife <= 25)
                 {
 
                     GameObject.FindWithTag("HeadLamp").light.range = lightRange * batteryLife / 20;
             
                 
                 }
         }
     
         
     
     }