How can I set an array for the use of this playerpref code??

Im using a script here for a level unlock that grabs integers from some levels in my game. The integers are then used in the menu. If the saved integer is equivalent to 0 that means that the level has not been completed yet. Whereas when the savedlevel integer is set to 1 the level has been completed (as set from completion of the first level) unlocking the box collider in the menu. I have over 50 levels. That would mean that i would have 50 individual scripts for every level and a really long Menu script (since i have to fill in all the if's and else if's) how can i shorten this code and fit all 50 levels?

Here is the code;

 // MENULEVELLOCKER.js
 
 #pragma strict
 
 // This is where you plug in the GUITextures for the unlocked and the locked states for each level
 var level1Unlocked : GUITexture;
 var level1Locked : GUITexture;
 var level2Unlocked : GUITexture;
 var level2Locked : GUITexture;
 var level3Unlocked : GUITexture;
 var level3Locked : GUITexture;
 var Level1 : String;
 var Level2 : String;
 var Level3 : String;
 //These are the actual "buttons" that we use to click on to trigger an action to happen.
 //In our case they cause a level to be loaded depending on the collider you click on.
 //You will drag the collider button for each level into it's corresponding slot in the inspector.
 var level1Collider : GameObject;
 var level2Collider : GameObject;
 var level3Collider : GameObject;
 
 // This is where we create a variable slot for playerPrefs to plug in the set number for each level once it's won or not won.
 // playerPrefs will plug in "0" for a Not Won state and will plug in the level's number for the Won State.
 var levelReached1 : int = 0;
 var levelReached2 : int = 0;
 var levelReached3 : int = 0;
 
 // Let's grab the saved data for each level and grab that integer to use to load that level
 levelReached1 = PlayerPrefs.GetInt("Level1");
 levelReached2 = PlayerPrefs.GetInt("Level2");
 levelReached3 = PlayerPrefs.GetInt("Level3");
 
 function Update () 
 {    
 
     if(levelReached1 == 1) //if we've set the level won to 1 then disable the locked texture and enable the unlocked one
         {                      
             level1Unlocked.enabled = true; //remember Level1 is always unlocked by default...if not how will anyone play our game?
             level1Locked.enabled = false;
             level1Collider.SetActive(true);
             
             level2Unlocked.enabled = true;
             level2Locked.enabled = false;
             level2Collider.SetActive(true);
         }
       else if(levelReached1 == 0) //this is our case if the level you just played wasn't won yet.
         {
             level1Unlocked.enabled = true;
             level1Locked.enabled = false;
             level1Collider.SetActive(true);
             
             level2Unlocked.enabled = false;
             level2Locked.enabled = true;
             level2Collider.SetActive(false);
         }
     if(levelReached2 == 2) //if we've set the level won to 2 then disable the level 3 locked texture and enable the unlocked one
         {
             level3Unlocked.enabled = true;
             level3Locked.enabled = false;
             level3Collider.SetActive(true);
         }
     else if(levelReached2 == 0) //this is our case if the level you just played wasn't won yet.
         {
             level3Unlocked.enabled = false;
             level3Locked.enabled = true;
             level3Collider.SetActive(false);
         }
     if(levelReached3 == 3) //if we've set the level won to 3 then disable the locked texture and enable the unlocked one
         {
           //this is where Level 4 is supposed to go :)
         }
       else if(levelReached3 == 0) //this is our case if the level you just played wasn't won yet.
         {
     
         }
         
     if (Input.GetMouseButtonDown (0)) {
         var ray = Camera.main.ScreenPointToRay (Input.mousePosition); //typical mouse click input
         var hit:RaycastHit;
     if (Physics.Raycast (ray, hit, 20)) {
         
         if(hit.collider.tag == "Finish") //this is all of our code for triggering loading levels when a collider is clicked on
         Application.LoadLevel(Level1);
         
         if(hit.collider.tag == "Finish")
         Application.LoadLevel(Level2);
         
         if(hit.collider.tag == "Finish")
         Application.LoadLevel(Level3);
         }
     }
 }

And here is the PlayerPref set for level 1

 function OnTriggerEnter(other : Collider) 
 {
     //
     if(other.gameObject.tag =="Player")
         {
             PlayerPrefs.SetInt("SavedLevel1", 1);
             Debug.Log("SavedLevel = 1");
             //
             yield WaitForSeconds(2.0); // wait for 5 seconds
             Application.LoadLevel("MainMenu");
         }
 }
 

Thanks so much ;)