Need help figuring how to add more time to timer

Hi everyone, I've done a lot of revising to my scripts here:

 static var initiated = false;
 
 function OnTriggerEnter (col : Collider) {
     if(col.name == "Player")     
         GameObject.Find("DoubleRockets").GetComponent("gunscript");
 
     gunscript.initialSpeed += 50;
     initiated = true;
 
     if(initiated == true) 
         GameObject.Find("SpeedPowerup1").GetComponent("SpeedPowerup1");
 
     SpeedPowerup1.timerStarted = true;  
     initiated = false;   
     Destroy(gameObject);
 }


 var barDisplay : float = 3;
 static var timeLeft : float = 15;  //amount of time on timer
 static var gunSpeedReduced = false;
 static var finishTimer = false; //i made this global so you can access from other scripts
 static var timerStarted = false;
 
 function Update() {
     if(timerStarted == true) {
         timeLeft -= Time.deltaTime;
     }
     if(timeLeft <= 0.0f) {
         timerStarted = false;
     }
     if(timerStarted == false && timeLeft <= 0.0f) {
         Activate();
     }
 }
 function Activate() { 
     if(timeLeft > 0.0f && gunSpeedReduced == true)
         gunSpeedReduced = false;  
     else if(timeLeft <= 0.0f && gunSpeedReduced == false)
     {
         GameObject.Find("DoubleRockets").GetComponent("gunscript");
         gunscript.initialSpeed -= 50;
         gunSpeedReduced = true;
     }
 }
 
         

The problem I am having is that when I collide with a gameobject with the first script attached and the timer runs out, it isn't resetting if I collide with another gameobject with that same script attached.

Also, I want to have it so that if I collide with two or more game objects with that same script attached, I want the amount of timeLeft to be added to any remaining time already being counted down.

I hope this makes sense and any input or help is greatly appreciated.