How can I find the name of the parent table from a table cell?

I have something like this:

<table name="test" id="test">
  <tr>
    <td><input type="button" onClick="showMeParentTableName();"></td>
  </tr>
</table>

How can I have my input button show me the table of it's parent table?
(eg. "test" in this case)
Received on Mon Oct 24 02:12:57 2005