attribute forbidden but needed?

Error Line 11, Column 23: there is no attribute "frameborder" 
<frameset frameborder="0" cols="280,*,40"  rows="*"> 

Validating http://www.mmlk.de/
Error [108]: "there is no attribute X"

yes, the attribute "frameborder" is forbidden in frameset
but if I delete this attribute I get a white border in the middle frame, which has the attribute frameborder="0"
(look at the source of www.mmlk.de/index.html)
I have tested the file with konqueror and firefox

Therefore it seems I need the forbidden attribute!

what is wrong?

Can somewhere help me?

Thanks
WHanisch

please forgive my rusty english

-- 
Dr. Wilfried Hanisch, Lehnertstraße 4 01324 Dresden --49 .351 2666555

Received on Monday, 26 March 2012 08:05:11 UTC