[рони]

Black_Star,

$(function() {
function openTraining (training, box){

 	training.on('click', function () {

 		$('div[id$="_Box"]').not(box).hide();
 		box.toggle('slow');
 		$('#information >.children').not(training).removeClass('open');
 		training.toggleClass('open');

 	})

 }

   var $es = $('#easy') ;
   var $av = $('#average') ;
   var $ha = $('#hard') ;

   var $es_box = $('#easy_Box') ;
   var $av_box = $('#average_Box') ;
   var $ha_box = $('#hard_Box') ;

 	openTraining ( $es, $es_box);
 	openTraining ( $av, $av_box);
  openTraining ( $ha, $ha_box);

});