Adding Row to Table with Contents

Can someone show me how to add a row on to this table when the "add" button is clicked?

I want this to be added when the button gets clicked:
<tr>
<td>
<input type="file" name="fileupload[]">
</td>
</tr>

<input type="button" name="add">
<form name="upload" method="post" action="upload.php" enctype="multipart/form-data">
<table>
<tr>
<td>
<input type="file" name="fileupload[]">
</td>
</tr>
<tr>
<td>
<input type="file" name="fileupload[]">
</td>
</tr>
<tr>
<td>
<input type="submit" name="submit">
</td>
</tr>
</table>
</form>

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