Maybe you should explain a little more what you actually want to do and what you did so far.
I also recommend strongly to read the "how to read the functions guide" article.
The menu allows you to set the id for the toplevel `<ul>` and it's child `<li>`. Additionally you can set the class for the sublevel `<ul>` and `<li>` as well.
The menu comes with predefined classes for the menu item type you can use for styling as well. I suggest to take a look at the generated source code.
I've solved my menu with imagination and CSS (i'm a better designer than programmer) and my last question, not very important, is: can "active" sections have link also?
You can view my menu running here: http://cestlaviestudi.com/index.php