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(
	'/images/nav-interiors-on.png',
	'/images/nav-television-on.png',
	'/images/nav-graphics-on.png',
    '/images/nav-about-on.png',
    '/images/nav-contact-on.png',
	'/images/navi-interiors-on.png',
	'/images/navi-television-on.png',
	'/images/navi-graphics-on.png',
    '/images/navi-about-on.png',
    '/images/navi-contact-on.png'
);