User Functions Lesson 2, Box 2 Completed Script

key Owner;
key av;
integer chan;
integer listen_handle;

Say(key av, string msg)
{


     llRegionSayTo(av,0,msg);


}


default
{
   state_entry()
   {

     Owner = llGetOwner();
     chan = -(integer)("0x"+llGetSubString((string)llGetKey(),-8,-1)) -38628;

   }

   on_rez(integer start_param)
   {

     llResetScript();

    }

   touch_end(integer num)
   {

      av = llDetectedKey(0);

     Say(av,"You touched me!");

    llSetTimerEvent(120.0);
    listen_handle = llListen(chan,"",av,"");
    llTextBox(av, "\nTell me something good:", chan);

   }

   collision_start(integer num)
   {
      av = llDetectedKey(0);

    //Call your function below this comment:
      Say(av,"Ouch! You hit me!");

   }

   listen(integer channel, string name, key id, string msg)
   {

      if(channel == chan)
      {

        llListenRemove(listen_handle);
        av = id;

     //Call your function below this comment:
       Say(av,msg);

      }

    }

    timer()
    {

     llSetTimerEvent(0.0);
     llListenRemove(listen_handle);

    }
}