Sliding Menu sorry if its allready out here somewhere

I am desiging or at least trying to design a menu bar/navigation holder that comes out when you mouse over it and pulls back to the left when you mouse out of it, I am totally lost and I’ve searched the tuts and haven’t found anyway of doing it how I want, it needs to be a accordian style auto resizing pull out box I have what I am drawing ready but no code works hoping someone can help me here, I will continue searching anyways.