Yes that's exactly what I mean. So I've changed the doctype and took out the conditional stylesheet for this page
But at least in my IE the submenu still disappears. I've also noticed that while hovering over submenu items but not over the text links inside them everything is fine. So is the change of doctype the only way how to resolve those "confusing lines"? However, IE shouldn't open this page
in quirk mode now, should it?