var errfound = false;

function ValidateLength(item, len) {
   return (item.length >= len);
}

function ValidateEmail(item) {
   if (!ValidateLength(item, 5)) return false;
   if (item.indexOf ('@', 0) == -1) return false;
   return true;
}

function FormError(elem, text) {
   if (errfound) return;
   window.alert(text);
   if(elem.type == 'text') {
      elem.select();
   }  
   elem.focus();
   errfound = true;
}

function ValidateReservation(form,code) {
   errfound = false;

   if (!ValidateLength(form.farrival.value,1))
      FormError(form.farrival,"Pflichtfeld: Termin von");
      
   if (!ValidateLength(form.fdays.value,1))
      FormError(form.fdays,"Pflichtfeld: Nächte");      

   if (!ValidateLength(form.frooms.value,1))
      FormError(form.frooms,"Pflichtfeld: Zimmer");
      
   if (!ValidateLength(form.fadults.value,1))
      FormError(form.fadults,"Pflichtfeld: Kinder");
      
   if (!ValidateLength(form.fchilds.value,1))
      FormError(form.fchilds,"Pflichtfeld: Dětí");            
   
   if (!ValidateLength(form.fname.value,1))
      FormError(form.fname,"Pflichtfeld: Nachname, Vorname");
      
   if (!ValidateEmail(form.fmail.value))
      FormError(form.fmail,"Pflichtfeld: E-mail");
   
   if (code > 0)
     if (!ValidateLength(form.fcode.value,1))
        FormError(form.fcode,"Pflichtfeld: Bitte geben Sie den Code ein");
      
   return !errfound;
}