function doopenChildWindow(zielhtml,breite,hoehe) {
  openChildWindow = null;
  properties = "toolbar=no,location=no,directories=no,status=no,scrollbars=yes,resizable=no,copyhistory=no";
  openChildWindow = window.open(zielhtml,openChildWindow,'top=0,left=0,width='+breite+',height='+hoehe+','+properties,'');
  openChildWindow.focus();
}