[Rails] Drop Down Menu in Navigation Bar?

I would like to design a drop down menu to use in my navigation bar.

I know that twitter bootstrap has one, but I would like to design my
own since many of the sites that are using twitter bootstrap are
beginning to look alike.

Does anyone know of a good tutorial on how to go about designing such
a drop down menu?

Or ... maybe you could point me in the direction of a resource that I
could study to see how they did it?

I am in need of a tutorial since I am still on the learning curve.

Thanks.

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