Simple Movement in JavaScript

Hi,

I’m building a website, I have a fixed navigation menu at the top, this is great until you want to see all the page, so I have been trying to make it hide when something is clicked. The menu script looks quite simply like this <div class=“Menu” id=“Header”>. **I want this Div to move up off the page by 180px when a button, image or text is clicked, then I want it to return back onto the page when that button or whatever is clicked again. **Any help at all would be great.

Thanks in advance

Gareth