ciao!

ho un problema con il responsive menu e foundation.
in pratica, compare il classico hamburger menu, ma cliccandoci sopra non succede nulla.
codice:
<div class="title-bar" data-responsive-toggle="responsive-menu" data-hide-for="medium">
    <button class="menu-icon" type="button" data-toggle="responsive-menu"></button>
    <div class="title-bar-title">Menu</div>
</div>
<div class="top-bar" id="responsive-menu">
    <div class="top-bar-left">
        <ul class="dropdown menu" data-dropdown-menu>
            <li class="menu-text">MP Notes</li>
            <li><a href="<?php echo BASE_URL_NOTES; ?>">Home</a></li>
            <li><a href="<?php echo BASE_URL_NOTES; ?>nota.php">Aggiungi nota</a></li>
        </ul>
    </div>
</div>
qualche idea??