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/Spatial/images/header-ls.jpg',
    '/App_Themes/Spatial/images/header-background.jpg',
    '/App_Themes/Spatial/images/header-rs.jpg',
    '/App_Themes/Spatial/images/bar-ls.jpg',
    '/App_Themes/Spatial/images/bar-background.jpg',
    '/App_Themes/Spatial/images/bar-rs.jpg',
    '/App_Themes/Spatial/images/menu-ls.jpg',
    '/App_Themes/Spatial/images/panel-ls.jpg',
    '/App_Themes/Spatial/images/images/menu-title-background.jpg',
    '/App_Themes/Spatial/images/footer-background.jpg',
    '/App_Themes/Spatial/images/item-background.jpg'
);