Limit object position which is moved by accelerometer

Hello Everybody!

For my android game I control an object with the accelerometer along the x-axis. It works all fine. My problem is to limit the movement at the edges e.g that the object can only move between -10 and 10.

Here's my script:

 // Move object using accelerometer
 var speed = 10.0;
 
 function Update () {
     var dir : Vector3 = Vector3.zero;
 
     // we assume that device is held parallel to the ground
     // and Home button is in the right hand
     
     // remap device acceleration axis to game coordinates:
     //  1) XY plane of the device is mapped onto XZ plane
     //  2) rotated 90 degrees around Y axis
     dir.x = Input.acceleration.y;
     
     // clamp acceleration vector to unit sphere
     if (dir.sqrMagnitude > 1)
         dir.Normalize();
     
     // Make it move 10 meters per second instead of 10 meters per frame...
     dir *= Time.deltaTime;
     
        
     // Move object
         transform.Translate (dir * speed);
 }

I hope that anyone can help.

Greetings from Germany! Josef