[jQuery] TableSorter - Multiple header handling?

[R. Rajesh Jeba Anbiah]

    I'm little lost when setting up TableSorter on a table that with
multiple header:
<table>
 <thead>
  <tr><th colspan="2">Main</th></tr>
  <tr><th>Sub1</th><th>Sub2</th></tr>
 </thead>
 <tbody>
  <tr><td>S1</td><td>S2</td></tr>
 </tbody>
</table>

   The sorter has to be applied only on the sub-header. Has anyone
come across similar situation and if so, please give me some hints.
TIA


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