function off()
 {
  document.getElementById('menudiv').style.zIndex = 3;
  document.getElementById('engine').style.zIndex = 1;
  document.getElementById('transmission').style.zIndex = 1;
  document.getElementById('steering').style.zIndex = 1;
  document.getElementById('chassis').style.zIndex = 1;
  document.getElementById('corner').style.zIndex = 1;
  document.getElementById('non').style.zIndex = 1;
 }

function engine()
 {
  document.getElementById('menudiv').style.zIndex = 2;
  document.getElementById('engine').style.zIndex = 3;
  document.getElementById('transmission').style.zIndex = 1;
  document.getElementById('steering').style.zIndex = 1;
  document.getElementById('chassis').style.zIndex = 1;
  document.getElementById('corner').style.zIndex = 1;
  document.getElementById('non').style.zIndex = 1;
 }

function transmission()
 {
  document.getElementById('menudiv').style.zIndex = 2;
  document.getElementById('engine').style.zIndex = 1;
  document.getElementById('transmission').style.zIndex = 3;
  document.getElementById('steering').style.zIndex = 1;
  document.getElementById('chassis').style.zIndex = 1;
  document.getElementById('corner').style.zIndex = 1;
  document.getElementById('non').style.zIndex = 1;
 }

function steering()
 {
  document.getElementById('menudiv').style.zIndex = 2;
  document.getElementById('engine').style.zIndex = 1;
  document.getElementById('transmission').style.zIndex = 1;
  document.getElementById('steering').style.zIndex = 3;
  document.getElementById('chassis').style.zIndex = 1;
  document.getElementById('corner').style.zIndex = 1;
  document.getElementById('non').style.zIndex = 1;
 }

function chassis()
 {
  document.getElementById('menudiv').style.zIndex = 2;
  document.getElementById('engine').style.zIndex = 1;
  document.getElementById('transmission').style.zIndex = 1;
  document.getElementById('steering').style.zIndex = 1;
  document.getElementById('chassis').style.zIndex = 3;
  document.getElementById('corner').style.zIndex = 1;
  document.getElementById('non').style.zIndex = 1;
 }

function corner()
 {
  document.getElementById('menudiv').style.zIndex = 2;
  document.getElementById('engine').style.zIndex = 1;
  document.getElementById('transmission').style.zIndex = 1;
  document.getElementById('steering').style.zIndex = 1;
  document.getElementById('chassis').style.zIndex = 1;
  document.getElementById('corner').style.zIndex = 3;
  document.getElementById('non').style.zIndex = 1;
 }

function non()
 {
  document.getElementById('menudiv').style.zIndex = 2;
  document.getElementById('engine').style.zIndex = 1;
  document.getElementById('transmission').style.zIndex = 1;
  document.getElementById('steering').style.zIndex = 1;
  document.getElementById('chassis').style.zIndex = 1;
  document.getElementById('corner').style.zIndex = 1;
  document.getElementById('non').style.zIndex = 3;
 }