<form id="login_box" action="{form_action}" method="post">
    <fieldset>
        <legend>Login</legend>
        <input type="hidden" name="return" value="true" />
        <input type="text" placeholder="{label_name}" id="username" name="username" />
        <input type="password" placeholder="{label_pass}" id="password" name="password" />
        <input id="loginBtn" type="submit" name="login" value="{label_login}" />
    </fieldset>
</form>