I have a website with a mega-menu. On the homepage we're looking for maximum exposure of the website categories (and we can spare the room) while the internal pages have plenty of content.
So I've been thinking about placing the mega-menu expanded on the homepage, acting more like an accordion, and collapsing it on the internal pages, acting like a standard mega-menu. The menu is not huge and not overloaded, it will probably be about 300px high and have up to 20 items in each category, usually closer to 10.
Is it a good idea to have a header which is always expanded on the homepage, but collapses by default on the internal pages?
I know I saw this behavior on a few websites, but I can't locate any right now. Have you seen this anywhere?