function chkFormular()
  {
    if(document.kontaktform.Vorname.value == "")
    {
     alert("Please insert your firstname!");
     document.kontaktform.Vorname.focus();
     return false;
    }

    if(document.kontaktform.Nachname.value == "")
    {
     alert("Please insert your lastname!");
     document.kontaktform.Nachname.focus();
     return false;
    }

    if(document.kontaktform.Strasse.value == "")
    {
     alert("Please insert your adress!");
     document.kontaktform.Strasse.focus();
     return false;
    }
     if(document.kontaktform.PLZ.value == "")
    {
     alert("Please insert your ZIP!");
     document.kontaktform.PLZ.focus();
     return false;
    }
     if(document.kontaktform.Ort.value == "")
    {
     alert("Please insert your city!");
     document.kontaktform.Ort.focus();
     return false;
    }
    if(document.kontaktform.Land.value == "")
    {
     alert("Please insert your state!");
     document.kontaktform.Land.focus();
     return false;
    } 
  if(document.kontaktform.Telefon.value == "")
    {
     alert("Please insert your telephone number!");
     document.kontaktform.Telefon.focus();
     return false;
    } 
    
   if(document.kontaktform.EMail.value == "")
    {
     alert("Please insert your e-mail-adress!");
     document.kontaktform.EMail.focus();
     return false;
    }
   if(document.kontaktform.EMail.value.indexOf('@') == -1)
    {
     alert("The e-mail-adress is not correct!");
     document.kontaktform.EMail.focus();
     return false;
    }
   if(document.kontaktform.Datenschutz.checked != true)
    {
     alert("Please read the text of the data protection!");
     document.kontaktform.Datenschutz.focus();
     return false;
    }
}