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) {
                
                b1_01_over = newImage("http://www01.anan-nct.ac.jp/images/b1_01-over.jpg");
                b2_01_over = newImage("http://www01.anan-nct.ac.jp/images/b2_01-over.jpg");
                b3_01_over = newImage("http://www01.anan-nct.ac.jp/images/b3_01-over.jpg");
                b4_01_over = newImage("http://www01.anan-nct.ac.jp/images/b4_01-over.jpg");
                b5_01_over = newImage("http://www01.anan-nct.ac.jp/images/b5_01-over.jpg");
		junior1______1_over = newImage("http://www01.anan-nct.ac.jp/wp-content/gallery/sozai/junior1_1-over.png");
                preloadFlag = true;
        }
}