Highlighting the left menu of the current SharePoint page

I have discovered that it is in fact quite simple and effective:

function highlightCurrentMenu() {
 var As = document.getElementsByTagName("A");

 for (var i=0; i
  if (As[i].className == "zz2_QuickLaunchMenu_1 ms-navitem zz2_QuickLaunchMenu_5") {
   if (As[i].href == document.location) {
    As[i].style.fontWeight = "bold";
    As[i].parentNode.style.backgroundColor = "#dddddd";
    break;
   }
  }
 }
}