[Typo3] Login-Error / IE6

[Frank]

Hello Ng,

Just ran into troubles when using IE6 (SP2) in my typo3 (3.7) backend. I 
wanted to select a picture in a content element, but typo3 shows me ...

Login-error
No user logged in! Sorry, I can't proceed then!
(You must have cookies enabled!)

The same happens with any other pop-up window. Firefox is ok, so I 
thought it has something to do with the IE6 cookie settings. 
Unfortunately tweaking them didnt do the trick.

I had a look in the ng/faq/howto, but couldn't find a solution for this. 
Any ideas?

Thanks!

Frank Henne