//variables to keep track of current tabs, and folders
var currentTab = "Tab1";
var currentFolder = "Folder1";
 
//function to switch tabs, and folders
function turnOn(newTab, newFolder) {
  if  (currentTab != newTab) {
   var thisTab = document.getElementById(newTab);
   <!--thisTab.style.backgroundColor = "#000066";-->
   var oldTab = document.getElementById(currentTab);
   <!--oldTab.style.backgroundColor = "#180f53";-->
   
   currentTab = newTab;
   
  var thisFolder = document.getElementById(newFolder);
  thisFolder.style.display = "block";
  var oldFolder = document.getElementById(currentFolder);
  oldFolder.style.display = "none";
  
  currentFolder = newFolder;
   }
}