How to display imenu content in speedbar

I would like to display imenu content in Emacs Speedbar. Best as a flat list (like in with imenus) (not a tree-like structure). In speedbar - Display menu I have only the following options:

• Files
• Quick Buffers
• Buffers
• Info
• Eieio
• Analyze (only after calling semantic-speedbar-analysis)

I wrote this for myself so there is no documentation, but all you should have to do is put it somewhere in your load-path and:

(require 'sb-imenu)

Start speedbar and choose the sb-imenu display.