var preloaded = new Array();
function preload_images() {
  for (var i = 0; i < arguments.length; i++) {
    preloaded[i] = document.createElement('img');
    preloaded[i].setAttribute('src', arguments[i]);
  };
};

preload_images(
  '/App_Themes/PortalVZ/Images/MenuTop/menuItem1.jpg',
  '/App_Themes/PortalVZ/Images/MenuTop/menuItem2.jpg',
  '/App_Themes/PortalVZ/Images/MenuTop/menuItem3.jpg',
  '/App_Themes/PortalVZ/Images/MenuTop/menuItem4.jpg',
  '/App_Themes/PortalVZ/Images/MenuTop/menuItem5.jpg',
  '/App_Themes/PortalVZ/Images/MenuTop/menuItem6.jpg',
  '/App_Themes/PortalVZ/Images/MenuTop/menuItem7.jpg',
  '/App_Themes/PortalVZ/Images/MenuTop/menuItem8.jpg',
  '/App_Themes/PortalVZ/Images/MenuTop/menuItem9.jpg',
  '/App_Themes/PortalVZ/Images/MenuTop/menuItem10.jpg',
  '/App_Themes/PortalVZ/Images/MenuTop/menuItem1small.jpg',
  '/App_Themes/PortalVZ/Images/MenuTop/menuItem1smal2.jpg',
  '/App_Themes/PortalVZ/Images/MenuTop/menuItem1smal3.jpg',
  '/App_Themes/PortalVZ/Images/MenuTop/menuItem1smal4.jpg',
  '/App_Themes/PortalVZ/Images/MenuTop/menuItem1smal5.jpg',
  '/App_Themes/PortalVZ/Images/MenuTop/menuItem1smal6.jpg',
  '/App_Themes/PortalVZ/Images/MenuTop/menuItem1smal7.jpg',
  '/App_Themes/PortalVZ/Images/MenuTop/menuItem1smal8.jpg',
  '/App_Themes/PortalVZ/Images/MenuTop/menuItem1smal9.jpg',
  '/App_Themes/PortalVZ/Images/MenuTop/menuItem1smal10.jpg'
);