ai script help. please help this script.

Basically I want this script to be simple, when you get within a certain radius the AI looks at you. Right now I'm getting plenty of errors from unity. I will address them in the end.

THE SCRIPT:

 var target : Transform; //target most likely player
 var AI : Transform; //the AI itself
 private var LookAtTarget = false; //doesn't look on play
 var radiusA = 2.0; // The first radius I will use for this AI
 var damp = 5.0; // rotation damping
 
 
 function Update() 
 {
             //within radius
 if(target.position - AI.position).magnitude < radiusA 
     {
     LookAtTarget = true;
     }
 
 }
 
 function LateUpdate() 
 {
           if LookAtTarget = true;
         {
                         //looks at target
              var rotate = Quaternion.LookRotation
              (target.position - transform.position);
 
                         //rotation damping
              transform.rotation = Quaternion.Slerp
              (transform.rotation, rotate, Time.deltaTime * damp);
          }
 } 
 
 THE ERRORS:
 
 Assets/Ai talking .js(10,34): BCE0043: Unexpected token: ..
 
 Assets/Ai talking .js(10,57): UCE0001: ';' expected. Insert a semicolon at the end.
 
      line 10
 if(target.position - AI.position).magnitude < radiusA 
 
 Assets/Ai talking .js(12,22): BCE0044: expecting :, found '='
 
      line 12
 LookAtTarget = true;

I understand what their saying. Its getting in the way of what I'm doing, or so I think.