Re: Fw: Web site accessibility-layers

> right by using a margin or padding to the p, h1, h2 elements). The
* reason I did not push the entire content box further to the left
> to accomodate the navigation is because browsers interpret differently
* its width in percentages, the space from the left edge and
> often return an horizontal scroll bar.

Just to be clear here, you are using z-index as a hack to deal with 
broken implementations of CSS, not because this was the intended purpose.

> In this case z-index is quite important because it can decide whether
* the navigation is or is not displayed. Even if both boxes
> would have transparent background if the navigation is "beneath"
* the content box you still wouldn't be able to click on the links
> (or so I've found in my experience).

I would warn you that there is a bug in Gecko that has been open for
several years now with respect to the resolution of links when 
blocks are overlapped.