function pruefen()
{
res = true;
a = document.error;
if(a.nachname.value == ''){res = false;}
if(a.mail.value == ''){res = false;}
if(a.kommentar.value == ''){res = false;}
if(a.sicherheitscode.value == ''){res = false;}
if(res == false){alert(unescape("Bitte alle * Pflichtfelder vollst%E4ndig ausf%FCllen%21"))}
return res;
}