function popup(url) {
 fenster = window.open(url, "Popupfenster", "width=600,height=500,resizable=no,scrollbars=yes");
 fenster.focus();
}
function popupagb(url) {
 fenster = window.open(url, "Popupfenster", "width=483,height=613,resizable=no,scrollbars=yes");
 fenster.focus();
 return false;
}