How do you sort a column that contains multiple tds? Look at this example:
<table cellspacing="1" class="tablesorter"> <thead> <tr> <th colspan="2">first name</th> <th>last name</th> </tr> </thead> <tbody> <tr> <td><input type="checkbox" name="cb_1" /></td> <td>peter</td> <td>parker</td> </tr> <tr> <td><input type="checkbox" name="cb_2" /></td> <td>john</td> <td>hood</td> </tr> </tbody> </table> Clicking on the "first name" header should sort on the second cell of each row.