Unity Gui lable problem with showing js var using C#

i get the following errors on my script: Assets/Scripts/HUD.cs(27,21): error CS1502: The best overloaded method match for UnityEngine.GUI.Label(UnityEngine.Rect, string)' has some invalid arguments AND Assets/Scripts/HUD.cs(27,21): error CS1503: Argument #2' cannot convert float' expression to type string'

My script HUD.cs contains the following code:

 using UnityEngine;
 using System.Collections;
 
 public class HUD : MonoBehaviour 
 {
     //create a variable to access the JavaScript script
     private Health jsScript; 
     
     void Awake()
     {
         //Get the JavaScript component
         jsScript = this.GetComponent<Health>();//Don't forget to place the 'JS1' file inside the 'Standard Assets' folder
     }
     
     //render text and other GUI elements to the screen
     void OnGUI()
     {
         //render the JS1 'message' variable
         GUI.Label(new Rect(10,10,300,20), jsScript.health);
 
     }
 
 
 }

and my JS code is the following:

 var MaxHealth=100.0;
 var health = MaxHealth;
 var regenTime = 20.0;
 var regenSpeed = 3.0;
 
 private var timer = 0.0;
 
 function Update(){
 if(health <= 0){
 die();
 }
 
 if(health>MaxHealth){
 health=MaxHealth;
 }
 
 if(health < MaxHealth){
 
 if(timer < regenTime){
 timer+=0.1;
 }else{
 health+=regenSpeed/10;
 }
 
 }else{
 timer = 0.0;
 }
 }
 
 
 
 
 function die(){
 
 }