CSS tables, speed

I need a table which has a fixed header and scrollable content. I found a couple of links: here and here, but I get strange effects in Safari: it is difficult to make the heading columns line up with the data columns...there seems to be  2px offset between Firefox and Safari, accumulating with each column. I'll finish this today so it looks ok at least in Firefox.

The RunList application is up now, link here, with run details added in the links. One worry has been speed, and this seems to be down to pyCool. A bug was filed to look into this.