window.onload = function() {
  /**
   * Make the whole of the sidebar advert clickable
   */
  var adverts = document.getElementById("sidebar").getElementsByTagName("div");
  for (var i = 0; i < adverts.length; ++i) {
    adverts[i].className = adverts[i].className + ' hover-cursor';
    adverts[i].onclick = function() {
      // Check it has a link, use the link href to redirect
      if (this.getElementsByTagName("a").length)
        window.location = this.getElementsByTagName("a")[0].href;
    }
  }
}