As reported by a user:
<td><a href=”#” class=“modify” onClick=“new Ajax.Request(‘url’,
{asynchronous:true, evalScripts:true,
method:‘post’});Element.show(‘tr_lp_3’);return false”>Update</a></td>
sorttable.js throws a fit when it gets this column.
The node is null when it gets to line 206 of the script. I might study
the problem and submit a patch if time allows.