function getFileName(file_url){
  file_url = file_url.substring(file_url.lastIndexOf("/")+1,file_url.length)
  file_url = file_url.substring(0,file_url.indexOf("."));
  return file_url;
}

Event.observe(window, "load", function(){

  var leftUrl;
  var fileName;
  var fileNameTab;

  fileName = getFileName(location.href);

  if (fileName == "" ) {
    fileName = "index";
  }

  switch(authType){
    case "Member" :
      if((fileName == "activelog") || (fileName == "backnumber")){
        leftUrl = "./" + fileName + "_left.html";
      } else {
        leftUrl = "../" + fileName + "_left.html";
      }

      break;

    default :
      leftUrl = "./" + fileName + "_left.html";
      break;
  }

  // new Ajax.Updater({ success: "TabMenu"}, "./tabmenu.html", { method: 'get'});
  new Ajax.Updater({ success: "LeftContents"}, leftUrl, { method: 'get'});
  new Ajax.Updater({ success: "RightContents"}, "./right_menu.html", { method: 'get'});
  $(fileName).className="tabMenuActive";

},true);