how to not display icons over static layout ?

Hi,

I searched a little bit, but I did not found any answers.

I am developping a web application, with ckeditor to enable
some advanced formattings Inside it, I
have a div on the top, which is fixed, and does
not scroll when user use the scrollbar.

I have a problem with the integration of ckeditor,
specially with its icons in toolbars. The problem is:
when user scrolls down, they are displayed over the top
static div, most of the buttons inside this static div are not accessible anymore
(because icons are over them).

Any idea to fix this ?
Any help would be appreciate