Distance between avatar and object (use to limit functions by proximity)

vector objPos;
default
{


    touch_end(integer num)
    {

       objPos = llGetPos();  // get the position of the object
       key Toucher = llDetectedKey(0);




       list tmp = llGetObjectDetails(Toucher,[OBJECT_POS]);

       vector avPos = llList2Vector(tmp,0);  // get the position of the avatar who clicked the object.

       float distance =  llVecDist(objPos,avPos); // get the distance between the object and the avatar.

       if(distance < 10.0 ) // if the distance is less than 10 meters.
       {

          llInstantMessage(Toucher,"You are " + (string)llRound(distance) + " meters from the object");

          // do other stuff

       }

       else     // avatars distance is further than 10 meters
       llInstantMessage(Toucher, "You are too far away! Come closer.");






    }


}