Making JS Interact with C# Variables

I need some help with my JS code interacting with my C# variables. I do not know how to make them interact with each other. I would like it to subtract 100 from score if the player is dead, however, if the player kills another player, this player gets 200 points. Here is my code:

c#

 using UnityEngine;
 using System.Collections;
 
 public class ScoringSystemGUI : MonoBehaviour {
     static int score = 0;
     // Use this for initialization
     void Start () {
         //No Start Commands, so leave this area empty (in case a future update requires it)
     }
     
     // Update is called once per frame
     void Update () {
        //This is important................................... xD
       guiText.text = "Score"+score; //Display, on the Graphic User Interface, the score on the top right (or left) of the screen.
     }
 }
 

js

 #pragma strict
 #pragma implicit
 #pragma downcast
 
 class SoldierDamageControl extends MonoBehaviour
 {
     public var life : float;
     public var Respawn : Vector3[];
     public var Parent : GameObject;
     public var hitTexture : Texture2D;
     public var blackTexture : Texture2D;
     public var Skin : GUISkin;
     public var Local : boolean;
     
     public var Soldier : GameObject;
     public var Gun : GameObject;
     
     public var KilledStyle : GUIStyle;
     public var ActorNr : int;
         public var ActorName : String;
     public var DisplayKillYou : boolean;
     
     private var hitAlpha : float;
     private var blackAlpha : float;
     private var AtackerName : String;
     private var actorText : GameObject;
     private var actorTextOffset : Vector3 = new Vector3(0,1.0f,0);
     
     private var recoverTime : float;
     
     public var hitSounds : AudioClip[];
     public var dyingSound : AudioClip;
     var score = 0;
     function SetActorNr(DataActor : Hashtable)
     {
         ActorNr = DataActor["actornr"];
         ActorName = DataActor["actorname"];
         if(actorText == null && gameObject.layer != 13)
         {
             this.actorText = Instantiate(Resources.Load("ActorName"));
             this.actorText.name = ActorNr+"";
             actorText.transform.localScale = new Vector3(1.4 / 8f, 1.4 / 8f, 1.4 / 8f);
         }
         
     }
     
     function Start()
     {
         SoldierController.dead = false;
         hitAlpha = 0.0;
         blackAlpha = 0.0;
         life = 1.0;
         KilledStyle = Skin.GetStyle("Killed");
     }
     
     function HitSoldierGranade(hit : String)
     {
 
         if(GameManager.receiveDamage)
         {
             if(!audio.isPlaying)
             {
                 if(life < 0.5 && (Random.Range(0, 100) < 30))
                 {
                     audio.clip = dyingSound;
                     score =- 200;
                 }
                 else
                 {
                     audio.clip = hitSounds[Random.Range(0, hitSounds.length)];
                 }
                 
                 audio.Play();
             }
          if(gameObject.layer != 13)
          { 
          
                 var _usePhoton : GameObject;
                 _usePhoton = GameObject.Find("_GameManager/UsePhoton");                
                 _usePhoton.SendMessage("DownLifeGranade", ActorNr);
                 
             return;
          }
          
             life -= 1.0;
 
             recoverTime = (1.0 - life) * 10.0;
             
             if(hit == "Dummy")
             {
                 TrainingStatistics.dummiesHit++;
             }
             else if(hit == "Turret")
             {
                 TrainingStatistics.turretsHit++;
             }
             
             if(life <= 0.0)
             {
                 AtackerName = hit;
                 SoldierController.dead = true;
                 DisplayKillYou = true;
                 
             }
             
         }
     }
     
     
     
     
     function HitSoldier(hit : String)
     {
         if(GameManager.receiveDamage)
         {
             //To do Enviar reduccion de life
             if(!audio.isPlaying)
             {
                 if(life < 0.5 && (Random.Range(0, 100) < 30))
                 {
                     audio.clip = dyingSound;
                     score += 200;
                 }
                 else
                 {
                     audio.clip = hitSounds[Random.Range(0, hitSounds.length)];
                 }
                 
                 audio.Play();
             }
         
          if(gameObject.layer != 13)
          { 
  
                 var _usePhoton : GameObject;
                 _usePhoton = GameObject.Find("_GameManager/UsePhoton");                
                 _usePhoton.SendMessage("DownLife",ActorNr);
                 
                 return;
          }
             life -= 0.05;
             
 
             
             recoverTime = (1.0 - life) * 10.0;
             
             if(hit == "Dummy")
             {
                 TrainingStatistics.dummiesHit++;
             }
             else if(hit == "Turret")
             {
                 TrainingStatistics.turretsHit++;
             }            
             if(life <= 0.0)
             {
                 AtackerName = hit;
                 DisplayKillYou = true;
                 SoldierController.dead = true;
      
             }
             
         }
     }
     
     function DisplayCountDown(time : int)
     {
         yield WaitForSeconds (time);
         DisplayKillYou = false;
     }
     
     function Update()
     {
         
         
     
         if(actorText != null)
         {
         
             var textMesh : TextMesh =  actorText.GetComponent(TextMesh);
             textMesh.text = ActorName;
             // text looking into oposite direction of camera
             this.actorText.transform.position = transform.position + this.actorTextOffset;
             var camDiff : Vector3 = actorText.transform.position - Camera.main.transform.position;
             var lookAt : Vector3 = actorText.transform.position + camDiff;
             this.actorText.transform.LookAt(lookAt);
         }
        
         recoverTime -= Time.deltaTime;
         
         if(recoverTime <= 0.0)
         {
             life += life * Time.deltaTime;
             
             life = Mathf.Clamp(life, 0.0, 1.0);
             
             hitAlpha = 0.0;
         }
         else
         {
             hitAlpha = recoverTime / ((1.0 - life) * 10.0);
         }
     
         if(!SoldierController.dead)
         { 
             blackAlpha = 0.0;
  
             return;
         }
         
         
         blackAlpha += Time.deltaTime;
         
         if(blackAlpha >= 1.0)
         {
             life = 1.0;
             hitAlpha = 0.0;
             blackAlpha = 0.0;
             recoverTime = 0;
             if(SoldierController.dead)
             {
                     var _DeadUsePhoton : GameObject;
                     _DeadUsePhoton = GameObject.Find("_GameManager/UsePhoton");
                     _DeadUsePhoton.SendMessage("Dead", Respawn[Random.Range(0, 13)]);        
             }    
             SoldierController.dead = false;
             
             
             //Application.LoadLevel(0);
             //Application.LoadLevel(1);
         }
         
 
         
         if(DisplayKillYou)
         {
             DisplayCountDown(7);
         }
     }
     
     function OnGUI()
     {
         if(DisplayKillYou)
         {
             if(AtackerName != "Player"){
                 GUI.Label(Rect (Screen.width - 200,60,200,50),AtackerName+" killed you",KilledStyle);
             }else
             {
                 GUI.Label(Rect (Screen.width - 200,60,200,50),"killed yourself",KilledStyle);
             }
         }
         if(!GameManager.receiveDamage) return;
         if(gameObject.layer != 13){ 
             return;
         }
 
         var oldColor : Color;
         var auxColor : Color;
         oldColor = auxColor = GUI.color;
         
         auxColor.a = hitAlpha;
         GUI.color = auxColor;
         GUI.DrawTexture(new Rect(0, 0, Screen.width, Screen.height), hitTexture);
         
         auxColor.a = blackAlpha;
         GUI.color = auxColor;
         GUI.DrawTexture(new Rect(0, 0, Screen.width, Screen.height), blackTexture);
         
 
         
         GUI.color = oldColor;
     }    
 }