function popup(zielurl,fenstername,breite,hoehe,menu,adressleiste,statusbar,scrollen,aendern)
  {
	popup_window=window.open(zielurl,fenstername,"location="+adressleiste+",status="+statusbar+",menubar="+menu+",width="+breite+",height="+hoehe+",scrollbars="+scrollen+",resizable="+aendern);
	popup_window.focus();
  }