missing table in IE

Help! I can't figure out why this table won't show up in Internet Explorer (v. 7, in Windows). The table (id="popsizelegendtable") is viewable in Firefox but totally disappears in IE. I have no idea what's going on. Here's the unprocessed source. Is it a CSS style issue? Or is some of my javascript overwriting some styles? The nodes and data are still there in the HTML tree, but it just isn't viewable. I feel like I've turned every display to block and zoom to 1 and am out of ideas.