function popup(url,width,height,scrollbars,popupname) {
        if (scrollbars) {
                properties_str = "toolbar=0,width=" + width + ",height=" + height + ",directories=0,status=0,scrollbars=1,resizable=1,menubar=0,location=0"
        } else {
                properties_str = "toolbar=0,width=" + width + ",height=" + height + ",directories=0,status=0,scrollbars=0,resizable=1,menubar=0,location=0"
        }
        window.open(url,popupname,properties_str);
}