Upgrade Paths

I made adjustments to the upgrade paths table to utilize mouseover and also tried to use tabs but there was an error I cannot identify, if you look at the page you'd see what I mean. (If you look after this issue is resolved assuming we find one then you probably won't see what I mean unless you look at revision history.)

Although the template's coding would be messy and take a while to code, and at first users may not understand how to use it, but I think it would be more efficient to input upgrade data into an item's data page (and I think upgrade data is formed in an xml) and allow a style template to calculate upgrade paths for us and automatically position/uniform the tables. Should I attempt to pursue this?