Toc hover issue 202

https://github.com/dart-lang/dartlang.org/issues/202

Underline removed on hover. 

![screen shot 2013-11-13 at 11 00 18 pm](https://f.cloud.github.com/assets/654526/1538976/74547cfc-4cfa-11e3-9c05-110106d22850.png)