You can see my issue here:
http://pmind.com/staging/123.html
I've tested this in Chrome, Safari, Firefox and Opera so I know it's not just an Internet Explorer wonky bug.
In the top right of the content, there are two text links, that are being hidden under the graphic. The <div> that contains the text links comes further down in the page, and my understanding was that that alone would make the z-index of the links such that they would be on top. But because that didn't do it, I set the z-index of the <div> containing the text links manually, which still didn't fix the problem.
One partial solution I found was to set the z-index of everything on the page but the <div> to -1. This however broke the roll-over functionality of the navigation items. I hate to ask something like this, and then it be some extremely simple issue I've just overlooked, but I'm at my wit's end.