IE, the divs and 100 %

Hi there,

I have a IE layout problems, look:
http://boxfly.free.fr/test/test_div/index.html

A screenshot:
http://boxfly.free.fr/test/test_div/result-IE.jpg

The problem comes from the 100% of the form-line-header-white div. If
I fix it at 90% it's ok, but fixed at 100% makes the div go to the
left !
If this is fixed at 90%, it's ok:
http://boxfly.free.fr/test/test_div/index2.html

In this css file:
http://boxfly.free.fr/test/test_div/index_files/command_base _form.css

Does anyone know how to fix it at 100% with IE ?

Thanks,
Vincent.