Problem with megamenu - CSS ?

helle
i don't kown if the css or another problems, but the menu bug when i click on a link.

[img] http://arthenos.be/scree/Sans titre.png

thank

for the color , it's ok
but if you look the printscreen , you can see the other problem, the right menu is above the line between the colon

screenshot of the problems (Explorer, in the last version, where there are the problem)

1 - line on left ok ( ie -opera - mozilla)

2 - line on left hidden when click on "GFF-Namu" ( ie -opera - mozilla)

3 - module problem ( opera)

4 - border menu problem - put the background in white too see it easily ( ie -opera - mozilla)