function popup (url) {
 fenster = window.open(url, "Popupfenster", "width=400,height=500,resizable=yes");
 fenster.focus();
 return false;
}

function popup2 (url) {
 fenster = window.open(url, "Popupfenster", "width=400,height=500,resizable=yes,scrollbars=yes");
 fenster.focus();
 return false;
}

function popup3 (url) {
 fenster = window.open(url, "Popupfenster", "width=1050,height=450,resizable=yes,scrollbars=yes");
 fenster.focus();
 return false;
}