Issues with mouse moving camera

Hi all,

I'd like to start by saying that this script works fine, I just need some guidance on how to do three things (pointers are great don't need anyone to write my game for me !)

1. The mouse feels jittery, is there a way to smooth the movement?

2. I can't seem to think of how to stop scrolling right and left at certain points for example where the camera starts is point 0 the camera can only scroll left to say 100 and it can't exceed 100 left or go less than the initial position 0 right.

3. I'm (obviously) just getting started around here but I feel that constantly spamming the screen width a hundred times a second or whatever the rate is seems clunky, is there a smarter way to accomplish this?

I've tried moving the variable around places (function start, awake etc. but funny things start to happen with the borders. I used LateUpdate because I read that camera controls should be in there and not in update???

Anyways, Here's the little script

 var CameraToMove:Camera;
 var CameraSpeed = 10;
 var Border : int = 50;
 
 function LateUpdate () 
 
 {
     var WideScreen = Screen.width;
 
         if (Input.mousePosition.x > WideScreen - Border)
         {
             CameraToMove.transform.Translate(CameraSpeed*Time.deltaTime,0,0);
         }
         if (Input.mousePosition.x < 0 + Border)
         {
             CameraToMove.transform.Translate (-CameraSpeed*Time.deltaTime,0,0);
         }
 }

So thanks for reading this giant block o' text, any hints or tips would be much appreciated!