var BuchungsFenster = null;

function goBuch() {

      if ( BuchungsFenster == null ) {
        BuchungsFenster = window.open(
             '', 'Buchungsanfrage', 'toolbar=no, width=750, height=550, directories=no, status=yes, scrollbars=yes, resize=yes, menubar=no');
      } else {
         if ( BuchungsFenster.closed ) {
            BuchungsFenster = window.open(
                                         '', 'Buchungsanfrage', 'toolbar=no, width=750, height=550, directories=no, status=yes, scrollbars=yes, resize=yes, menubar=no');
         } else {
            BuchungsFenster.focus();
         }
      }

      document.bkrequest.target="Buchungsanfrage";

	document.bkrequest.arrival.value=document.bkrequest.anDD.value+"."+document.bkrequest.anMM.value+"."+document.bkrequest.anYYYY.value;
	document.bkrequest.departure.value=document.bkrequest.abDD.value+"."+document.bkrequest.abMM.value+"."+document.bkrequest.abYYYY.value;
      document.bkrequest.action="http://www.hoteldaten.com/koop-apis/wdba/dorequest.php"; 
      /* document.bkrequest.action="https://secure.webres.net/webres/portal4/default.asp?PTID=504&LY4=J"; */
      document.bkrequest.submit();
      document.bkrequest.action="goBuch()";
      document.bkrequest.target="_self";
    }