var $showAll = $('#show-all'),
$wrapper = $('.wrap'),
$rollBack = $('#roll-back');
$showAll.on({
click: function(){
$wrapper.addClass('shown');
$showAll.hide();
$rollBack.show();
}
});
$rollBack.on({
click: function(){
$wrapper.removeClass('shown');
$showAll.show();
$rollBack.hide();
}
});