function popup_menu() {
    window.open('menu.html','popup_menu','width=500,height=600,resizable=no,scrollbars=yes');
}

function popup_360tour() {
    window.open('http://iwp360.com/Milkyway/TopPage_mw.html','popup_360tour','width=670,height=725,resizable=yes,scrollbars=no');
}