This is a 9 theme Accordion Menu template for the already installed 'Auto-Nav' block with your 'Concrete5' site.

Colours -
-
Plain

Grey
Black

Blue
Glass
Green
Orange
Pink
Red
Yellow

You wont regret buying :)
If you require more information then please don't hesitate to contact me.
IMPORTANT: I do not support add-on if core files has been editted. it's like buying a car, changing the engine and then taking it back to the place you bought it from saying it doesn't work!

Add-On Example - http://themes.chriswatterston.com/accordion-menu/

Usage after installation:
1) Add an auto-nav to your page and configure it to show the part of your site tree you want in the accodian. 

2) Update/save the block and go back to edit mode where you're looking at the page and highlighting blocks.

3) Click the auto-nav you just added, but instead of edit, hit Custom Templates

4) Choose Accordion and enjoy 

UPDATE - - -
4th July 2010 - 1.1 - Script to give ID to the first 'li' item on the menu.
8th July 2010 - 1.2 - Multi submenu depth bug fix.
12th September 2010 - 1.3 - JQuery added to backend for users to enable a menu stick option, new 'Glass' theme added.
23rd October 2010 - 1.4 - CSS added to highlight current links and checked compatibility with c5 version 5.4.1.
12th March 2011 - 1.5 - Fixed browser backend 'Warnings' that display using menu, these where not visable on screen.
13th April 2011 - 1.6 - Fixed external link bug when selecting to open in a new window "blank_". Added NEW 'Stripped' theme!
14th September 2011 - 1.7 - Fixed Bugs, Displays arrows when dropdown is avalable and now keeps menu dropped open by default.