[jQuery] Clone dont work. Why?

[Antonio Jozzolino]

        <div class="add-more">
                <label for="empresas_coligadas_ou_filiais" class="label-
ecf">Empresas Coligadas ou Filiais</label>
                <input name="empresas_coligadas_ou_filiais" type="text"
maxlength="255" />
                <span class="bt-more"></span>
            <span class="bt-less"></span>
        </div>

        $('span.bt-more').bind('click', function(){
            var e = $(this).parent()[0];
                e.parent().clone().after(e);
        });

Where is the error?

Thanks.

Antonio