Slider dont work in IE 8 and primary menu have not width and height

Hey, I’am making site and client want to use IE 8 or 7(no idea why). I have problem because slider in Adamos theme dont work preperly. I see images in my slider but slider look like images merge in one. Is there any solution for this? Or maybe slider dont work in this versions of IE?

Another problem is that primary menu is not visible. When I check it, there is no width and heigh in IE, but even if I give them it, it’s still invisible.

I’d be greatful for any help ??

Wojtek