guitext and texture following gameobject, how to destroy and alternatives?

Having the same problem, please help. I can not find anything. After the gameobject is destroyed the clone remains., Here is my Java script for it. Thank you for your time.

 var CurrentHealth:float;
 var $$anonymous$$axHealth:float;
 var healthbarWidth:int;
 var myHealthbar:GameObject;
 var myhb:GameObject;
 var target : Transform; 
 
 
 
 function Start()
         {
 healthbarWidth=20;
 myhb=Instantiate(myHealthbar,transform.position,transform.rotation);
 }
 
 function Update (){
     myhb.transform.position=Camera.main.WorldToViewportPoint (transform.position);
     myhb.transform.position.x-=.00;
     myhb.transform.position.y-=.00;
     myhb.transform.localScale=Vector3.zero;
     var healthpercent:float=CurrentHealth/$$anonymous$$axHealth;
     if(healthpercent<0){healthpercent=0;}
     if(healthpercent>100){healthpercent=100;}
     healthbarWidth=healthpercent*30;
     myhb.guiTexture.pixelInset=Rect(10,40,healthbarWidth,5);
 }
 
 
 function ApplyDamage (Damage : float) {
 
 
     if ( CurrentHealth < 0){
     
         
     return;
     
     }
     
     CurrentHealth -= Damage;
     
     if(CurrentHealth <= 0){
    Destroy(transform.root.gameObject);
 }
 }

One way is to keep a game object variable and destroy it in OnDestory()

 function OnDestroy () {
     Destroy(myhb);
 }

@ robertbu That dose kill the extra clone but dose not do what I need.

The problem I am having is that there are two health bars for one guy. The floating health bar works fine as long as you keep looking at him, he takes damage and he dies. But if you look behind you there is another health bar for the same enemy. Any help with this problem would be greatly appreciated.