How to set an action after sitting

string gStrAnimationName = "animation name";

default{
  state_entry(){
    //--sit target code goes here
  }

  changed( integer vBitChanges){
    if (CHANGED_LINK & vBitChanges){
      gKeyAvatar = llAvatarOnSitTarget();
      if (gKeyAvatar){
        llRequestPermissions( gKeyAvatar, PERMISSION_TRIGGER_ANIMATION );
      }//-- may need an else here to cancel animations when they get up, can't remember
    }
  }

  run_time_permissions( integer vBitPermissions ){
    if (PERMISSION_TRIGGER_ANIMATION & vBitPermissions){
      llStartAnimation( gStrAnimationName );
    }
  }
}