Markup validation

Hello, I have a website easytax123.co.uk where the second tab on the site
fails validation 

 

The validator insists that I have a border="0" attribute in my code. On
searching the source (view source from IE), I discovered that the line in
question had an in-line style attribute ' style="border-width:0px;" '.

 

Surely this should not fail validation? Can anyone shed any light on this?

 

The issue is though, I can't actually find where the in-line style is coming
from as it is an asp.net site and I haven't knowingly put that code in
anyway!

 

Thanks,

 

Terry