Any ideas for doing a digital camera zoom?

Here is a camera zooming script i have made - attach it to any camera in your scene.

Press 'w' to zoom in, 's' to zoom out.

 var FOV : float=60;//don't change this
 var zoomAcceleration : float=0.3;//How fast the camera zooms in and out 
 
 function Update () {
     
 //If 'w' is held down, zoom in        
     if (Input.GetKey("w")){
 FOV = FOV - zoomAcceleration;    
 camera.fieldOfView = FOV; 
     }
     
 //If 's' is held down, zoom out    
     if (Input.GetKey("s")){
 FOV = FOV + zoomAcceleration;    
 camera.fieldOfView = FOV; 
     }
 
 //Don't let the Field Of View go below 1    
 if (FOV<=1){
 FOV=1;
     }
 //Don't let the Field Of View go above 60        
 if (FOV>=60){
 FOV=60;
     }
 }