Sorting of topics in an <ul> dropdown?

Let's try with this approach suggested by @stealthwombat

The css should be improved... (you know I don't like it :crying_cat_face: )

![screen_119](https://f.cloud.github.com/assets/1095308/1064090/e1ead888-130c-11e3-9857-cf2f328ce94f.png)