Trying to switch Textures on object based on timer

Ok so I have done a complete revamp to the script including all of the changes made via suggestions in this question and another I have. The new and improved script is below. The only thing I think I need at this point to get it working is how do I call the textures in the array to replace First Texture, Second Texture, Third Texture, and Fourth Texture?

 var textureArray : Texture2D[];
 var damageAmount = int;
 var healAmount = int;
 var ammoAmount = int;
 var pointAmount = int;
 var damageDelay : float = 1;
 var healDelay : float = 1;
 var interval:float = 10; 
 var myTimer: float = 10;
 
 private var nextDamageAllowed : float;
 private var nextHealAllowed : float;
 private var nextAmmoAllowed : float;
 private var nextPointAllowed : float;
 
 function Update () 
 {
    if(myTimer > 0)
    {
       myTimer -= Time.deltaTime;
    }
    
    if(myTimer <= 0)
    {
       randomNumber = Random.Range(0, textureArray.length);
       renderer.material.mainTexture = textureArray[randomNumber];
       myTimer += interval;
    }
 }
 
 //When player enters trigger hurt them if the hurtTexture is active
 function OnTriggerEnter(thecollision : Collider)
 {
    if(theCollision.gameObject.tag == "Player" && First Texture)
    {
     GiveDamage;
    } else if (theCollision.gameObject.tag == "Player"  && Second Texture) {
       //when player enters trigger heal them if the healTexture is active
       GiveHeal;
    } else if (theCollision.gameObject.tag == "Player" && Third Texture) {
       //when player enters trigger give them ammo if the AmmoTexture is active
       GiveAmmo;
    } else if (theCollision.gameObject.tag == "Player" && Fourth Texture) {
       //when player enters trigger give them points if the PointTexture is active
       GivePoints;
    }
 }
 
 //when player stands on trigger hurt them periodically if the HurtTexture is active
  function OnTriggerStay(thecollision : Collider)
  {
     if (theCollision.gameObject.tag == "Player" && First Texture)
     {
        GivePeriodicDamage;
     } else if (theCollision.gameObject.tag == "Player"  && Second Texture) {
        //when player stands on trigger heal them periodically if the healTexture is active
        GivePeriodicHeal;
     } else if (theCollision.gameObject.tag == "Player" && Third Texture) {
       //when player stands on trigger give them ammo periodically if the AmmoTexture is active
       GivePeriodicAmmo;
     } else if (theCollision.gameObject.tag == "Player" && Fourth Texture) {
       //when player stands on trigger give them points periodically if the PointTexture is active
       GivePeriodicPoints;
   }
 }
 
 //Function to damage player for OnTriggerEnter
 function GiveDamage()
 {
    SendMessage("ApplyDamage", damageAmount, SendMessageOptions, DontRequireReceiver);
 }
 
 //Function to heal player for OnTriggerenter
 function GiveHeal()
 {
    SendMessage("Heal", healAmount, SendMessageOptions, DontRequireReceiver);
 }
 
 //Function to give ammo to player for OnTriggerEnter
 function GiveAmmo()
 {
    gunScript.clips += ammoAmount;
 }
 
 //Function to give points to player for OnTriggerEnter
 function GivePoints()
 {
    PointManager.points += pointAmount;
 }
 
 //Function to hurt player for OnTriggerstay
 function GivePeriodicDamage()
 {
   if(Time.time > nextDamageAllowed)
   {
       SendMessage("ApplyDamage", damageAmount, SendMessageOptions, DontRequireReceiver);
       nextDamageAllowed = Time.time + damageDelay;
    }
 }
 
 //Function to heal player for OnTriggerStay
 function GivePeriodicHeal()
 {
   if(Time.time > nextHealAllowed)
   {
      SendMessage("Heal", healAmount, SendMessageOptions, DontRequireReceiver);
      nextHealAllowed = Time.time + healDelay;
    }
 }
 
 //Function to give ammo to player for OnTriggerStay
 function GivePeriodicAmmo()
 {
   if(Time.time > nextAmmoAllowed)
   {
      gunScript.clips += ammoAmount;
      nextAmmoAllowed = Time.time + ammoDelay;
    }
 }
 
 //Function to give points to player for OnTriggerStay
 function GivePeriodicPoints()
 {
    if(Time.time > nextPointAllowed)
    {
      PointManager.points += pointAmount;
      nextPointAllowed = Time.time + pointDelay;
   }
 }