function popclose() {
  if (fenster && !fenster.closed) fenster.close();
}

function popup(url,w,h) {
  w = (w) ? w += 10 : 150;  // 150px*150px is the default size
  h = (h) ? h += 15 : 150;	 
 fenster=window.open(url, "Preisanfrage", "width="+w+",height="+h+",resizable,menubar=0,statusbar=0,scrollbars");
 fenster.focus();
 return false;
}