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) {
        nav_logo_tony_02_over = newImage("Slices/nav_logo_tony_02-over.jpg");
        nav_logo_tony_03_over = newImage("Slices/nav_logo_tony_03-over.jpg");
        nav_logo_tony_04_over = newImage("Slices/nav_logo_tony_04-over.jpg");
        nav_logo_tony_05_over = newImage("Slices/nav_logo_tony_05-over.jpg");
        nav_logo_tony_06_over = newImage("Slices/nav_logo_tony_06-over.jpg");
        preloadFlag = true;
    }
}