IE7 Problem

Dear Cedric,

Thanks for this wonderfull module. I have a problem and don't know how to solve. Maybe you can help me out on this one.

Work with joomla 1.5.23
Maximenu 4.30

question 1
I'd like to have the dropdown (on every submenu) as big (wide) as the complete nav-bar. How do I accomplish this?

question 2 (the biggest problem)
the multi column looks good in safari, chrome and firefox but the layout is totaly destroyed in IE7 (and maybe above, haven't tested yet)

To show what I mean see this link:
goo.gl/UsKZq

hope you (or anyone else) can help me out.

Thanks in advance,
Danny