how to write a javascript function to capture data from a table?

I have a simple table, however my table has php includes in the td. These include statements are dropdowns that create another table of data when clicked How can I write a javascript function to capture that data.

<table width="100%" hight="100%" border="1">
<tbody>
<tr>
  <th scope="col" width="10%">Table1</th>
  <td>

<?php include 'options_drop1.php'; ?>
<?php include 'options_drop2.php'; ?>
<?php include 'options_drop3.php'; ?>


   </td>
  </tr>
</tbody>
</table>