function init() {
    var questions = $$('.question').invoke('observe', 'click', toggleAnswer);
}

function toggleAnswer(e){

   var element = Event.element(e);

   var question = element.siblings();
   var img = question[0];
   
   var answer = question[1].down();

   if(answer.visible()){
      img.writeAttribute("src", "images/arrow-deactive.gif");
   }
   else
   {
      img.writeAttribute("src", "images/arrow-active.gif");
   }
   
   Effect.toggle(answer, 'slide', { duration: 0.4 });

   Event.stop(e);
   return false;
}

function toggleArrow(elem){
   var link = $(elem);
   var siblings = $('link').up.siblings();

   
}

Event.observe(window, 'load', init, false);