Changing camera target of CarSmoothFollow ( Js to c#)

Hi

I am trying to toggle between three characters and want to change the target of CarSmoothFollow to smoothly transition from character to character as they are each enabled. I have looked at the link---- http://answers.unity3d.com/questions/265193/how-to-change-what-prefab-the-camera-is-following.html---- but there is a problem in that CarSmoothFollow is in C# and I am cant script in c.

I tried doing it like this:

 var Astron_1 : Transform;
 
  if( blah blah blah){
     var AstroCam=(GameObject.Find("MainCamera1").GetComponent("CarSmoothFollow") as CarSmoothFollow);
     AstroCam.target=Astron_1;
     }
     

CarSmoothFollow is in Standard Assets but it doesnt work.

Any idea how I can get it to work ?