How to integrate jump into this script?

I'm using a script that came with a character from the asset store. Since all his animations and everything is already programmed in javascript. If i can see it right, he just plays the animation while some kind of collider or whatever is attached to him stays in same position but the body moves up a bit. Anyway...

 #pragma strict
 internal var animator:Animator;
 var v:float;
 var h:float;
 var run:float;
 var jumpHeight = 8; // MY ATTEMPT
 
 private var isFalling = false;
 function Start () {
     animator=GetComponent (Animator);
 }
 
 function Update () {
 
     v=Input.GetAxis("Vertical");
     h=Input.GetAxis("Horizontal");
     if (animator.GetFloat("Run")==0.2){
         if (Input.GetKeyDown(KeyCode.Space)){
         GetComponent.<Rigidbody>().velocity.y = jumpHeight;// MY ATTEMPT
             animator.SetBool("Jump",true);
         }
     }
     Sprinting();
     
 }
 
 function FixedUpdate (){
     animator.SetFloat("Walk",v);
     animator.SetFloat("Run",run);
     animator.SetFloat("Turn",h);
 }
 
 function Sprinting(){
     if (Input.GetKey(KeyCode.LeftShift)){
         run=0.2;
     }
     else
     {
         run=0.0;
     }
 }