If a page break occurs in a table with running table headers, the table headers are repeated for each page the table runs over. All you have to do to ensure the table headers are repeated is using the corresponding page markup.

Example:

<table>
    <thead>
        <tr>
            <td>A Simple Heading</td>
        </tr>
    </thead>
    <tr>
        <td>Row 1</td>
    </tr>
    <tr>
        <td>Row 2</td>
    </tr>
</table>