function openPopup(){
window.open("","_popup","toolbars=0,location=0,width=750,height=550");
return true;
}


var BuchungsFenster = null;
function go() {
	 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();
	 }

}