function navbarcattoggle(categoryname)
{
  // Toggle currently selected category tab off
  var categorycontainer = document.getElementById("navbarcat");
  var categoryboxes = categorycontainer.childNodes;
  for (var i=0; i < categoryboxes.length; i++)
  {
    if (categoryboxes[i].className == "navbarcaton")
    {
      categoryboxes[i].className = "navbarcat";
    }
  }
  
  // Toggle clicked category tab on
  var categorylayer = document.getElementById("navbarcat" + categoryname);
  categorylayer.className = "navbarcaton";
  
  // Toggle currently selected category links off
  var subcategorycontainer = document.getElementById("navbarsubcat");
  var subcategoryboxes = subcategorycontainer.childNodes;
  for (var i=0; i < subcategoryboxes.length; i++)
  {
    if (subcategoryboxes[i].className == "navbarsubcaton")
    {
      subcategoryboxes[i].className = "navbarsubcat";
    }
  }
  
  // Toggle clicked category tab on
  var subcategorylayer = document.getElementById("navbarsubcat" + categoryname);
  subcategorylayer.className = "navbarsubcaton";
}