Enemy AI; Run away from player (x and y)

I need some help with creating a script for the enemies in my game! I'm making a 2.5D game where you chase campers and try to kill them. I'm mostly done with the game, but I can't get the AI to work! I've looked around for scripts and help for a couple of days now but can't find anything that fits well with the rest of my game... Please help!

For my ground i have a flat surface rotated at 35 on the x-axis, which have worked pretty well for me so far (moving the character around and placing obstacles).

At this point I'm working on this script;

 #pragma strict
 
 //Attack button
 var attackButton : Joystick;
 
 var anim : Animator;
 var delay = 5.0;
 
 //Player can kill
 var CanKill = false;
 
 //Score
 var scoreValue : int;
 var killValue : int;
 var playerControl : PlayerControl;
 
 //AI
 var speed : int = 2;
 var Damp: float = 1.0;
 
 var isRun: boolean = false;
 var Target: Transform;
 
 var detectionRange: int = 5;
 
 private var character : CharacterController;
 
 function Start () 
 {
 
     anim = GetComponent("Animator");
     var playerControlObject : GameObject = GameObject.FindWithTag ("Player");
     
     character = GetComponent(CharacterController);
 
 
 }
 
 function WaitAndDestroy()
 {
 
     yield WaitForSeconds(delay);
         Destroy (gameObject);
         
 }
 
 function Update()
 {
 
     //Can the player kill?
     if (attackButton.tapCount == 1)
         CanKill = true;
         
     else CanKill = false; 
     
     //AI
     var FromPlayer =  Vector3(Target.position.x - transform.position.x, 0);
     
         if(FromPlayer.magnitude <= detectionRange){
             isRun = true;
         }
         
         if(FromPlayer.magnitude >= detectionRange) {
             isRun = false;
         }
         
         if(isRun) {
             RunAway();
             anim.SetBool("Walk", true);
         }
         
         else anim.SetBool("Walk", false);
         
         
 }
 
 function OnTriggerEnter (Other : Collider){
 
     if(Other.gameObject.tag == "Player" && CanKill == true) {
         playerControl.AddScore (scoreValue);
         playerControl.AddKills (killValue);
         anim.SetTrigger("Dead");
         WaitAndDestroy();
     }
     
 }
 
 function RunAway()
 {
     
     var moveDirection : Vector3 = transform.position;
     character.Move(moveDirection.normalized * speed * Time.deltaTime);
     
 }`

Which kinda works, but for some reason the character stops in the middle of the level and just runs in place... I would also like him to turn and run the other direction if I (the player) catches him and runs in front of him. (If the code is a little messy I apologize, but as I said I'm new to Javascript).