jquery.fixedthead v1.0.3

<table>
    <thead style="background: #ccc;">
        <tr>
            <th>First column</th>
            <th>Second column</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Accusantium asperiores, blanditiis consectetur
                deleniti dicta dolores dolorum eius exercitationem expedita explicabo facilis illum iste, labore libero
                maxime nihil quaerat vel veniam.
            </td>
            <td>Lorem ipsum dolor sit amet, consectetur adipisicing elit. A ab, aliquid atque distinctio, doloribus eligendi
                esse exercitationem facere id laboriosam, nobis odio odit officia perferendis quasi repellat suscipit
                temporibus vero.
            </td>
        </tr>
    </tbody>
</table>

$('#example').fixedThead({
    top: 50,
    zIndex: 1
});