Twitter Bootstrap scrollable table rows and fixed header

Does anyone know how to make a table with a fixed header row and scrollable body rows? I'm using twitter bootstrap if that matters.

This is an example of what I'm trying to create:

All the examples I've seen break it into two separate tables. Was wondering if anyone has a more elegant solution.

Twitter bootstrap also automatically adjusts the column sizes based on content so that's another reason I'd like to keep it in one table