Using GetComponent to get a script

So I'm trying to access a script using GetComponent, but I'm not sure how.

This was originally apart of a Unity 3D scene but now I'm trying to convert the code over to 2D. At first I was using the default Platform Input Controller to control my character, but I ended up making a new controller script from scratch. So that means I should be trying to reference the script. But apparently the "Script" reference does not exist. Because of that, I am at a loss on how to reference the script.

(here are the relevant parts of said script)

 #pragma strict
 
 var ChController : Transform; 
 var elevator : Transform;
 var climbNow : boolean = false;
 var isClimbing : boolean = false;
 var heightFactor : float = 3.0;
 var speed : float;
 private var PlatInput : PlatformInputController; 
 
 function Start () {
     PlatInput = GetComponent("CharacterControlTest");
 }
 
 function OnTriggerEnter(Col : Collider){
     if(Col.gameObject.tag == "Climber" /*&& Input.GetKey("e")*/){
         PlatInput.enabled = false;
         if (Col.attachedRigidbody) {
             Col.attachedRigidbody.isKinematic = false;
         }
         climbNow = !climbNow;
     }
 }
 
 function OnTriggerStay(Col : Collider){
     if(Col.gameObject.tag == "Climber"){
         if (Col.attachedRigidbody) {
             Col.attachedRigidbody.isKinematic = true;
         }
     print("stop");
     isClimbing = false;
     }
 }
 
 function OnTriggerExit(Col : Collider){
     if(Col.gameObject.tag == "Climber"){
         PlatInput.enabled = true;
         Col.attachedRigidbody.isKinematic = false;
         climbNow = false;
     }
 }