Questions about Viewports and large image navigation

Okay, so I'm working on a project using JavaScript and the basic UI we want to be a very large background image, and when you select the navigation menu items it propels you to a section on that large image.

I've tried findin开发者_如何学Gog documentation on Viewports and trying to figure out how Map applications function but have had very very minimal success.

It would basically be a Google map without the user being able to slide it. How in the world would I begin to approach this?

You can set the background-image property in CSS and use javascript to change the background-position.