function checkInput()
{
if(document.Formular.Kundenvorname.value == "" ||
   document.Formular.Kundennachname.value == "" ||
   document.Formular.Kundenstrasse.value == "" ||
   document.Formular.KundenPLZ.value == "" ||
   document.Formular.Kundenwohnort.value == "" ||
   document.Formular.Kundenemail.value == ""
   )
        {
                document.getElementById("Bestellbutton").disabled = true;     // Submit-Button ausblenden
        }
        else
        {
                document.getElementById("Bestellbutton").disabled = false;    // Submit-Button einblenden
        }
}