function open_popup (url,width,height) {
    param = "directories=no,menubar=no,toolbar=no,scrollbars=yes,resizable=yes,width=" + width + ",height=" + height;
    popup_window = window.open(url, "popme", param);
    if (!popup_window.opener) popup_window.opener = self;
}
function tour_popup (url,width,height) {
    param = "directories=no,menubar=no,toolbar=no,scrollbars=no,resizable=yes,width=" + width + ",height=" + height;
    popup_window = window.open(url, "virtualtour", param);
    if (!popup_window.opener) popup_window.opener = self;
}