IE underlines but Firefox not

[belsidaam]

Strange problem here

http://www.christopheolinger.com
I have two css files. One for everybody except IE6 (mainstyle.css) and one for IE6 only (mainstyleIE6.css).

The problem at the moment (there are others, I know):
I have a left navigation with buttons and rollover menus. The menus are inspired by CSSplay from Stu Nicholls.
I have an underscore for links that have a menu beneath them. If it is not clear what I mean, just look at the buttons. (About, projects,...)
These underscores only appear in IE6, not firefox. I just cannot find why they are there. I tried text-decoration:none everywhere but without success. Can somebody have a look?
Thanks

The site is accessipble. Just view the source code of the main page and look at the css files:
All except IE: http://www.christopheolinger.com/mainstyle.css
IE6 only: http://www.christopheolinger.com/mainstyleIE6.css

[codeexploiter]

1. The site took hell of time to load in Firefox

2. IE 7 shown a page cannot be displayed error

2. In the firefox the page contains nothing just a blank

[belsidaam]

I had to change hoster, since nothing works anymore. Unfortuantely, these things take long. So the site will have constant breakdowns in the next few weeks.

Sorry about his

[belsidaam]

Ok, sorry for this inconveniance. The problem still persists: A single underscore on some buttons only in IE.

The new site is: http://www.binarylooks.com
css for other browsers: http://www.binarylooks.com/mainstyle.css
ie only css: http://www.binarylooks.com/mainstyleIE6.css

[belsidaam]

Could somebody just have a small look please? I know you all love to find problems related to IE6 ;-)