JQuery Mobile apply style to newly added elements
===

In JQuery Mobile, I have a navigation bar like the following:

    <div id="nav_bar" data-role="navbar">
        <ul>
            <li><a>video</a></li>
            <li><a>music</a></li>
            <li><a>picture</a></li>
        </ul>
    </div>

Say now I want the nav bar to display "some content" only. This is my code:

    $("#nav_bar ul").html("some content");

But the built-in JQuery Mobile style is not applied to it. How can I do this?

Thanks in advance.