function reservation(sprache,user,aktion,logid) {
   var sprache, user, aktion, logid, scrheight;
   if (aktion == null) aktion = '';
   if (logid == null) logid = '';
   if (screen.availHeight > 600) {scrheight = screen.availHeight - 220;} else {scrheight = 460;}
   window.open("http://www.bookingsystem.ch/hotelmontana/booking.cgi?user="+user+"&lang="+sprache+"&action="+aktion+"&login="+logid,"booking","menubar=1,location=0,directories=0,toolbar=1,status=1,scrollbars=1,resizable=1,width=680,height="+scrheight);
   //window.open("http://infonautics/bookingsystem.p/hotelmontana/booking.cgi?user="+user+"&lang="+sprache+"&action="+aktion+"&login="+logid,"booking","menubar=1,location=0,directories=0,toolbar=1,status=1,scrollbars=1,resizable=1,width=680,height="+scrheight);
}