Enemy Follow Disable Y Axis

Hello, I have created a script to make an object follow the player, but my object follows on all 3 axes, when I only want it to move on the X and Z axes. My script is shown below:

  var target : Transform; //the enemy's target var moveSpeed = 3;

//move speed var rotationSpeed = 3; //speed of turning

var myTransform : Transform; //current transform data of this enemy

function Awake() { myTransform = transform; //cache transform data for easy access/preformance }

function Start() { target = GameObject.FindWithTag("Player").transform; //target the player

}

function Update () { //rotate to look at the player myTransform.rotation = Quaternion.Slerp(myTransform.rotation, Quaternion.LookRotation(target.position - myTransform.position), rotationSpeed*Time.deltaTime);

  //move towards the player

  myTransform.position += myTransform.forward * moveSpeed *

Time.deltaTime;

}