js : 

function AddRow()
{
    $('#myTable').append('<tr><td>test 2</td></tr>')
}

 

html

<table id="myTable">
  <tbody >
    <tr>
      <td>
        test
      </td>
    </tr>
  </tbody>
</table>

 

 

 

source : http://stackoverflow.com/questions/2160890/how-do-you-append-rows-to-a-table-using-jquery