function toggle(id){
	el=document.getElementById(id);
	el.style.display= el.style.display=='none'? '' :  'none';
	return false;
}
function fen(adresse) {
  fenster = window.open(adresse, "fenster", "width=640,height=480,scrollbars=yes,resizable=1");
  fenster.focus();
}