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) {
                head_04_over = newImage("/images/nav_head/head_04-over.jpg");
                head_07_over = newImage("/images/nav_head/head_07-over.jpg");
                head_08_over = newImage("/images/nav_head/head_08-over.jpg");
                head_09_over = newImage("/images/nav_head/head_09-over.jpg");
                head_10_over = newImage("/images/nav_head/head_10-over.jpg");
                head_11_over = newImage("/images/nav_head/head_11-over.jpg");
                order_01_over = newImage("/images/orderImages/order_01-over.gif");
                preloadFlag = true;
        }
}