var thisUrl = window.location + "";
var index = thisUrl.indexOf("//", 0);
var urlElements = thisUrl.substring(index + 2).split("/");
  while (urlElements.length > 1)
  {
    var urlElement = urlElements.pop();
  }  
  if (urlElement === "" || urlElement === "index.shtml"){
	  urlElement = "home";
  }
  var navToHighlight = urlElement + "_nav";
  document.getElementById(urlElement + "_nav").setAttribute("class", "active");
  document.getElementById(urlElement + "_nav").setAttribute("className", "active");