LAYOUT: 100% width & (Middle + sidebar) centered width 960px => how to do?

Hi everyone !


I do not know how to fix this "looks-like-easy" css issue.

http://www.avenueaparis.com/?page_id=39


HOW TO have the right sidebar intended in the 960 px layout?

Post should be 700 px
Sidebar: 260px

The layout is funky as the right sidebar sticks to the right side of the screen.

website design concept:
960px width website with 100% width footer.

Config of ATAH. + CSS:

LAYOUT: 100% width
> I did that to have a full footer background 100% width

POST:
width : 700px;

RIGHT SIDBAR; 250 px

I tried to fix the width of the CENTER column > nothing happened
I tried to fix the width of the MIDDLE table > nothing happened
I tried position:absolute of the sidebar > problems of rendering on different screen resolutions

In addition, the css should be compatible with IE...


I would like to change the php core files but I rather prefer to adjust css only.

Is there a solution for my problem? Am I the only one as this layout is pretty standard among the web...