// JavaScript Document

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) {
                navi_1o = newImage("../image/navi_1o.gif");
                navi_2o = newImage("../image/navi_2o.gif");
                navi_3o = newImage("../image/navi_3o.gif");
                navi_4o = newImage("../image/navi_4o.gif");
                navi_5o = newImage("../image/navi_5o.gif");
                preloadFlag = true;
        }
}