Help with chromemenu

[wright714]

1) Script Title:Chromemenu

2) Script URL (on DD):http://www.dynamicdrive.com/dynamici...rome/index.htm

3) Describe problem:
I don't want to seem stupid, but this is my first time installing a script like this.
I have created a website and would like to add one menu that is cascading horizonal, with two areas that cascade down along side my standard buttons. I guess what I am asking is this:

1. I already downloaded the zip file from the page. [nothing else]
2. What should I do with the files I downloaded?
3. Where do the files go to make this all work?
4. Basically how do I install these files.

I guess I need kind of a step-by-step procedure.

Once its working on the site I think I can customize it myself.

All help would be appreciated.

Best Regards,
wright714