function popup(url, breite, hoehe, scrol, resize){
var links = screen.width - breite; //Bildschirmbreite
var hoch = screen.height - hoehe; //Bildschirmhhe
var popleft = links/2;
var poptop = hoch/2;
obj=open(url, "popup", "width="+ breite +",height=" + hoehe +",top="+ poptop +",left="+ popleft +",resizable="+ resize +",directories=no,scrollbars="+ scrol +",menubar=no,location=no,toolbar=no")
obj.window.focus()
}