var name = "kontakt";
    var sign = "@";
    var domain = "meineipanzeigen";
    var circle = ".";
    var fin = "de";
    document.write('<a href=\"mailto:' + name + sign + domain + circle + fin + '\">');
    document.write('Kontakt [at] meineipanzeigen [punkt] de' + '</' + 'a' + '>');