<td class='sorting_1'> not highlighted when $(nRow).effect('highlight') called

Here is a demo to illustrate the issue: http://jsfiddle.net/halifaxious/UCtLa/

I would expect all the columns in a row to be affected by the jQueryUI highlight effect when it is applied to the row. But it seems that the background colour called for by the sorting class overrides the effect. I'd prefer not to remove the sorting column colour difference. Can someone suggest a way to make .effect(highlight) affect *all* the columns in a row?

Thanks,
Jen