function enterMenuItem(menuItem)
{
  menuItem.addClassName(menuItem.className + '-selected');
}

function leaveMenuItem(menuItem)
{
  menuItem.removeClassName('home-selected');
  menuItem.removeClassName('difference-selected');
  menuItem.removeClassName('services-selected');
  menuItem.removeClassName('team-selected');
  menuItem.removeClassName('testimonials-selected');
  menuItem.removeClassName('links-selected');
  menuItem.removeClassName('contact-selected');
}