tablesorter sorting by link value, not the text

tablesorter sorting by link value, not the text

My column looks like this 

<tr><td><a href="/manufacturers/10">BAR</a></td></tr>
<tr><td><a href="/manufacturers/11">FOO</a></td></tr>
<tr><td><a href="/manufacturers/12">BAZ</a></td></tr>

and it sorts just like that, or in reverse 12,11,10

I have jQuery-1.3.2 and tablesorter 2.0.3

Weird...