Javascript jumping touchpad.

Hi guys I made a left touchpad and when i press on it I want the character to jump but I cant get it working, here is my piece of code, can someone help me?

 ------------Code---------------------------------
 
 var jumper : GameObject;  
 var jumpSpeed: float = 12; // initial jump speed
 var gravity: float = 30;

 function Update () {
 
     for (var i = 0; i < Input.touchCount; ++i) {
 
         if (Input.GetTouch(i).phase == TouchPhase.Began) {
 
             
 
         }
 
     }
 
 }