acj: Very impressive. I checked out your design work too - I love your graphic art & design style. The drtgaming menu is awesome
There are a couple minor suggestions:
- The reset button isn't the most intuitive and might be better split into three (one for each tree).
- There may (or may not) be a bug whereby "previous tier" is being interpreted as across all 3 trees and not in its respective tree alone. I'm going to assume that due to the WoW interface Blizz is using that it will also follow the tree isolation (as it did with D2 as well).
From a design perspective I think this would be a good place to use Ajax instead of loading a lot of the images over and over when you switch between classes. The tooltip background images might also be pre-loaded as they tend to fail to fully load/display properly on the first try in some browsers.