var loaded = false;
ie = (document.all)? true:false;
ns = (document.layers)? true:false;
ns6 = (document.getElementById)? true:false;//ie5 compatible

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) {

                m_01_over = newImage("images/menu_left_topo.gif");
                m_02_over = newImage("images/menu_left_topo.gif");

                m_03_over = newImage("images/menu_left_techo.gif");
                m_04_over = newImage("images/menu_sub_tech01o.gif");
                m_05_over = newImage("images/menu_sub_tech02o.gif");
                m_06_over = newImage("images/menu_sub_tech03o.gif");
                m_07_over = newImage("images/menu_sub_techdio.gif");
                m_08_over = newImage("images/menu_sub_techspeco.gif");

                m_09_over = newImage("images/menu_left_gakakuo.gif");
                m_10_over = newImage("images/menu_left_catalogo.gif");
                m_11_over = newImage("images/menu_left_historyo.gif");
                m_13_over = newImage("images/menu_left_reporto.gif");
                m_14_over = newImage("images/menu_sub_repkudo.gif");
                m_15_over = newImage("images/menu_sub_repogio.gif");
                m_16_over = newImage("images/menu_sub_his01o.gif");

                m_12_over = newImage("images/a09_tech_pic07_02_on.gif");
                m_17_over = newImage("images/back02_t2o.gif");

                preloadFlag = true;
        }
}