Alternative to OnMouseDown()

This is the solution.

i use this for get component on target and use it function when i press joystick button 5,u may set condition in getkey to other.Destroy() ,hope this help.

 function Update () {
 
     var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
     var hit : RaycastHit;
     if (Physics.Raycast (ray, hit, 100)) {
         if ( hit.collider.gameObject.tag == "tag" ){
         var other: scriptname;
         other = hit.collider.gameObject.GetComponent("scriptname");
         if(other == "null"){
             Debug.Log("null script");
         }
         if(other != "null"){
             if(Input.GetKeyDown(KeyCode.JoystickButton5)){
             Debug.Log("ok script");
              other.Fn_on_target_script();
              }
          }
         }
       }
       
       
 }
 
 *******************
 on target script
 
 function Destroy(){
   Destroy (gameObject);
 }