Scripting Errors I cannot fix, Could use a helping hand and someone to tell me how to fix it:PART II

Well for an assignment I was to fix a few scripts on my own. I managed to fix one fully by myself and another to only having a few errors which kind people on here helped me fix. Now Ive managed to get this final script down to the last few errors. (Going from 22 to 5 and being stuck) IF anyone is willing to assist me in fixing the errors and telling me what was wrong with them and how to fix it I would really be grateful. I'm very new to the scripting scene but I want to learn all I can!

 public var health : int = 5;        // number of hits before game over
 public var moveSpeed : int = 3;    // horizontal speed
 public var jumpSpeed : float = 8;    // jumping speed
 public var turnSpeed : float = 2;    // turning rate
 
 private var controller : CharacterController;    // reference to CharacterController component
 private var velocity : Vector;                    // current speed
 
 function Start ()
 {
 
 }
 
 function Update ()
 {
     // assume no input
     velocity.x = 0;
     velocity.z = 0;
     
     // forward
     if (Input.GetKey("w") || Input.GetKey("up"))
     {
         velocity + transform.forward * moveSpeed;
     }
     // back
     else if(Input.GetKey("s") || Input.GetKey("down"))
     {
         velocity + transform.back * moveSpeed;
     }
     // turn left
     if(Input.GetKey("a") || Input.GetKey("left"))
     {
         transform.rotate(0, -turnSpeed, 0);
     }
     // turn right
     else if(Input.GetKey("d") || ("right"))
     {
         Transform.Rotate(0, turnspeed, 0);
     }
     
     if(isGrounded)
     {
         // jump
         if(Input.GetKeyDown("space"))
         {
             velocity += transform.up * jumpSpeed;
         }
         else
         {
             velocity.y = 0;
         }
     }
     // gravity
     velocity += Physics.gravity * Time.deltaTime;
     // apply motion
     controller.Move(velocity * Time.deltaTime);
 
 function onTriggerEnter()
 {
     // detection radius
     if(trigger.name == "Enemy")
     {
         // set enemy to alert
         // Enemy is the name of the enemy script
         // alert is a variable on the Enemy script
         trigger.GetComponent(Enemy).alert = true;
     }
     // getting hit
     else if(trigger.name == "Body")
     {
         health--;
         if(health <= 0)
         {
             transform.DetachChildren();
             Destroy(gameObject);
         }
     }
 }
 
 function OnTriggerEnter(trigger : collider)
 {
     // leaving detection radius
     if(trigger.name == "Enemy")
     {
         trigger.GetComponent(Enemy).alert = false;
     }
 }