var lastOpenedQuestion = null;


Event.observe(window, 'load', function(){
	$$('.toggleDisplayQuestion').each(function(elem){
		elem.observe('click', function(){
			if(lastOpenedQuestion != null)
				lastOpenedQuestion.removeClassName("selected");
			
			var question = elem.up().up();
				
			if (lastOpenedQuestion != question)
			{
				question.addClassName("selected");
				lastOpenedQuestion = question;
			}
			else
				lastOpenedQuestion = null;
		});
	});
});