A step-by-step instruction set with snippets will be much appreciated.
I’m sure it would but this isn’t the site for that. The people here like to give back to the web community in their spare time.
We can help you over any difficulties you might be having with you current code but we’re not here to write it for you.
If you can’t find the specific effect you are looking for with instructions after a lot of google searching…hire someone.
EDIT- Took me 30 seconds
http://cssdeck.com/labs/navigation-dropdown-with-flip-effect