[css-d] Screen readers, tabbed index, and display:none issues

Hi, I'm hopping some of our more advanced CSS gurus can assist here. We are looking to implement a three column layout, with the center section containing a tabbed index, similar to the one found at www.mediamatters.org, towards the bottom of the page. Lets use that as the example. The

[css-d] content div not aligning to top

I can't seem to get the center section of the page div id=content to align to the top of the space. I've been looking at this code all afternoon and cannot see what I am doing wrong. Any suggestions? http://www.hammersmith.ws/Census/tabbed/templateTabs.html Thanks, Carollynn