div float problem? IE hack needed?

[emanoelmelo]

Hi

I'm having a problem to convert the Solemnity template to wordpress theme.
This is the link: www.oficinapublicidade.com/assumpcao
As you can see, in FF the sidebar is longer than the content box. That is why the content box (black border) is shorter than should be. It needs to follow the sidebar height, but is not. Maybe because the sidebar is floated right?
In IE the problem is more weird. Visit here:

http://www.oficinapublicidade.com/assumpcao/?cat=1
The height is ok until you click on the post title (Bem-vindo), the is just cuts of also the sidebar! But when you click on the navigation links (top right), the height comes back to normal! I'm going crazy!!!! Maybe you that are more experient can help me out, please?
To help you guys see what is going on, i highlighted most of the divs, so whe

have:
red - wrapper1
green - footer
top-blue - header (does someone knows why the content is not IN this div?)
black - container
yellow - description
blue - sidebar

I guess the problem is in the 'container' div, cause the total height is determined according to his. Someone told me that is because he is cleared to both and cleared elements do that stuff. But i've tryed some tricks and hacks found on the web and had no sucess.
Another issue is the top and bottom margin on the wrapper1 element, that

shouldnt exists but is appearing on IE (6).
Can you guys help me to find a fix for this problems?