function winOpen(url, breite, hoehe) {
      links = (screen.width/2)-(breite/2);
      oben = (screen.height/2)-(hoehe/2);
      win = window.open(url,'popup',"height="+hoehe+",width="+breite+",status=yes,toolbar=no,menubar=no,location=no,resizable=yes,titlebar=no,scrollbars=yes,top ="+oben+",left ="+links);
      win.focus();
	return false;
}