function newImage(arg) {
    if (document.images) {
        rslt = new Image();
        rslt.src = arg;
        return rslt;
    }
}
function changeImages() {
    if (document.images && (preloadFlag == true)) {
        for (var i=0; i<changeImages.arguments.length; i+=2) {
            document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
        }
    }
}
var preloadFlag = false;
function preloadImages() {
    if (document.images) {
        home_over = newImage("images/home-over.png");
        artists_over = newImage("images/artists-over.png");
        exhibitions_over = newImage("images/exhibitions-over.png");
        restaurant_over = newImage("images/restaurant-over.png");
        store_over = newImage("images/store-over.png");
        contact_over = newImage("images/contact-over.png");
        preloadFlag = true;
    }
}