/* *********************************************************************** */
/* MENU
/* *********************************************************************** */
    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) {
        
            headermap_j_01_HeaderMap_02_over = newImage("images/imgmap/headermap-c_01-HeaderMap_02.gif");
            headermap_j_01_HeaderMap_01_over = newImage("images/imgmap/headermap-c_01-HeaderMap_01.gif");
            
            menumap_j_01_MenuMap_01_over = newImage("images/imgmap/menumap-j_01-MenuMap_01_ove.gif");
            menumap_j_01_MenuMap_02_over = newImage("images/imgmap/menumap-j_01-MenuMap_02_ove.gif");
            menumap_j_01_MenuMap_03_over = newImage("images/imgmap/menumap-j_01-MenuMap_03_ove.gif");
            menumap_j_01_MenuMap_04_over = newImage("images/imgmap/menumap-j_01-MenuMap_04_ove.gif");
            menumap_j_01_MenuMap_05_over = newImage("images/imgmap/menumap-j_01-MenuMap_05_ove.gif");
            menumap_j_01_MenuMap_06_over = newImage("images/imgmap/menumap-j_01-MenuMap_06_ove.gif");
            
            
            b_sensor_01_over    = newImage("images/btn/b_sensor_01-over.gif");
            b_products_01_over  = newImage("images/btn/b_products_01-over.gif");
            b_dc_sensor_01_over = newImage("images/btn/b_dc_sensor_01-over.gif");
            b_ac_sensor_01_over = newImage("images/btn/b_ac_sensor_01-over.gif");
            
            preloadFlag = true;
        }
    }