jquery to add tr & td to table is not working.

jquery to add tr & td to table is not working.

Hello,

I'm trying to add tr & td elements to my table which isn't working. am I missing something here ?

Thank you.

  2.     <table id="my_tbl">
  3.         <tr id="row1">
  4.             <td id="chart0"></td>
  5.             <td id="chart1"></td>
  6.         </tr>
  7.         <tr>
  8.             <td id="chart2"></td>
  9.             <td id="chart3"></td>
  10.         </tr>
  11.     </table>

  13. $('#my_tbl tr:last').after('<tr><td>&nbsp;</td><td>&nbsp;</td></tr>');