Access a JavaScript variable from a C# script?

I just started integrating the 2D toolkit into a little demo I've been working on. I've been doing everything in JavaScript but the 2DToolkit stuff all seems to be in C#. The scenario is I have a Hero(JS) who detects collision with coins, and I need to increment the score counter (C#). I've tried somethings and haven't been able to make it work. Here's my HUD script:

 using UnityEngine;
 using System.Collections;
 
 public class TextMeshExample : MonoBehaviour {
 
     tk2dTextMesh textMesh;
     int score = 0;
 
     // Use this for initialization
     void Start () {
         textMesh = GetComponent<tk2dTextMesh>();
     }
 
     // Update is called once per frame
     void Update () {
         //replace with something like textMesh.text = "SCORE: " HeroController.coinCount
         if (Input.GetKey(KeyCode.Q))
         {
             score++;
 
             textMesh.text = "SCORE: " + score.ToString();
 
             // This is important, your changes will not be updated until you call Commit()
             // This is so you can change multiple parameters without reconstructing
             // the mesh repeatedly
             textMesh.Commit();
         }
     }
 }

and here's part of my hero script:

 function OnCollisionEnter(collision : Collision) {
     if(collision.gameObject.name == "WaterBarrier") // If A collides with B
     {
         if (collision.relativeVelocity.magnitude > outOfWaterThreshold/100)
         {
             //Physics.gravity = Vector3(0, -1.5, 0);
             //transform.position = Vector3(-0.6948604, .5, 3.701174);
             print("We just hit the water level... Hard!!!");
             //Physics.gravity = Vector3(0, 3, 0);
             //transform.position = Vector3(-0.6948604, -.5, 3.701174);
         }
     }
     
     //If we hit a coin increment the count and destroy it
     if(collision.gameObject.name == "Coin" || collision.gameObject.name == "SilverCoin") 
     {
         transform.position = Vector3(transform.position.x, transform.position.y, 3);
         Destroy(collision.gameObject);
     
         if(collision.gameObject.name == "Coin")
         {
             coinCount = coinCount+1;
         }
         else if(collision.gameObject.name == "SilverCoin")
         {
             coinCount = coinCount+2;
         }
     }
 
     //If we hit a hazard increment the count and restart the level
     if(collision.gameObject.name == "Hazard")
     {
         Application.LoadLevel ("ProofOfConcept");
         hazardCount = hazardCount+1;
     }
 }

I'm trying my best, so if somebody could give me some insight I'd really appreciate it! Thanks so much!