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(
    '/img/bgcontainer.gif',
    '/img/bgheader.gif',
    '/img/topleft.gif',
    '/img/topright.gif',
    '/img/portfolio.gif',
    '/img/bgmenu.gif',
    '/img/home.gif',
    '/img/sitemap.gif',
    '/img/contact.gif',
    '/img/readmore.gif',
    '/img/frame.gif',
    '/img/arrow.gif',
    '/img/map_pointer.gif',
    '/img/bgfooter.gif'
);