var mo_lastMenu;
        var lastMenu = "null";
        if (document.layers) {
                visible = 'show';  hidden = 'hide';
                                                }
        else if (document.all) {
                visible = 'visible';  hidden = 'hidden';
        }
function toggle(menu) {
        if (document.layers) {
        Menu = document.layers[menu];
        }
        else if (document.all) {
        Menu = document.all(menu).style;
        }
        if (Menu.visibility == visible) {
        Menu.visibility = hidden;
        }
        else {
        clean(lastMenu);
                Menu.visibility = visible;
        }
        lastMenu = Menu;
        }
function clean(Menu){
        if (Menu == "null"){
                return;
        }
        if (Menu.visibility == visible) {
        Menu.visibility = hidden;
        }
        }
function mo_toggle(menu) {
        if (document.layers) {
        Menu = document.layers[menu];
        }
        else if (document.all) {
        Menu = document.all(menu).style;
        }
        if (Menu.visibility == visible) {
        Menu.visibility = hidden;
        }
        else {
                Menu.visibility = visible;
        }
        mo_lastMenu = Menu;
        }