Character won't jump script help.

I have followed a tutorial to the letter and while my character moves in a 2d planes like I want it doesn't seem to jump. I have the script here but can't figure out what went wrong.

Jump Script

 #pragma strict
 
 var dt : double;
 
 var jumpButton: String;
 var jumpDelay : float;
 var jumpForce : double;
 
 var canJump: boolean;
 var timeSinceLastJump: float;
 
 var base : GroundDetection;
 var movement : LateralMovement;
 
 function Start () {
 
 dt = Time.deltaTime;
 
 jumpButton = "Jump";
 jumpForce = 6;
 jumpDelay = 2.5;
 
 canJump = false;
 timeSinceLastJump = 10;
 
 base = gameObject.GetComponentInChildren(GroundDetection);
 movement = gameObject.GetComponent(LateralMovement);
 
 }
 
 function Update () {
 
 timeSinceLastJump += dt;
 
 if(base.onGround){
 
 movement.SetSuspension(false);
 
 if(timeSinceLastJump > jumpDelay){
 
 canJump = true;
 
 }
 
 else if (!AirControl()){
 
 movement.SetSuspension(true);
 
 if(canJump && Input.GetButton(jumpButton)){
 
 rigidbody.velocity.y += jumpForce;
 
 canJump = false;
 timeSinceLastJump = 0;
 
 }
 
 }
 
 }
 
 }
 
 function AirControl(){
 
 return rigidbody.velocity.y > 0;
 
 }