function open_new_window_page1()
{
    window.open('ThangLongHaNoi.htm', 'CustomPopUp', 'toolbar=0,menubar=0,resizable=0,dependent=0,status=0,width=543,height=768,scrollbars=yes')
}
function open_new_window_page2() {
    window.open('ThangLongHaNoi2.htm', 'CustomPopUp', 'toolbar=0,menubar=0,resizable=0,dependent=0,status=0,width=543,height=768,scrollbars=yes')
}