$(function() {
  
  changeNews($('.news > div:first'));
  
  $('.news > div').click(function() {
    changeNews(this);
  });
  
  function changeNews(object) {
    var newsitemNumber = $('.news').children('div').index($(object));
    $('.preview-news > div').hide();
    $('.preview-news > div:eq('+newsitemNumber+')').show();
  }
  
});