How can I hide the headers and still use the "sWidth"

Hi

I was noticed that I can't hide the headers of the table using css and use the "sWidth" attribute inside the aoColumnDefs

Cause if I combine the two the "sWidth" being ignored, here a jsfiddle http://jsfiddle.net/vedmack/xBvsS/
Notice that if you remove the css "sWidth" will be applied correctly

So I wondering how can I hide the headers and use the "sWidth" ?

Regards

Daniel.