User Functions Lesson 2, Box 2 Incompleted Script

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

// Write your function below this comment:








//  Write your function above this line.


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);

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


      //Call your function below this comment:




      //  Call your function above this line.




   }

   collision_start(integer num)
   {

    //Call your function below this comment:


   }

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

      if(channel == chan)
      {

        llListenRemove(listen_handle);
        av = id;

     //Call your function below this comment:


      }

    }


     timer()
    {

     llSetTimerEvent(0.0);
     llListenRemove(listen_handle);

    }
}