<div class="control-group">
    <label for="elm_attach_invoice" class="control-label">{__("email_template.params.attach_order_document")}:</label>
    <div class="controls">
        <input type="hidden" name="invoice[attach]" value="N" />
        <input type="checkbox" id="elm_attach_invoice" name="invoice[attach]" value="Y" />
    </div>
</div>
