I have an e-commerce site. I believe it makes sense to have a fixed header when a user scrolls down. This will show the items in the cart, and will also show the visitor when they have added a new item to the cart, as its done client side.
I also have the top nav fixed to the header as well. I was wondering if this is too much, and takes away from the screen size, particularly on low resolution screens. Thus taking away from the experience of the site.
Has anyone had any experience with conversions on keeping a fixed nav in the header. Presumably the intention is to help the visitor navigate, but do they really use it anyway? And is it that big a deal to have to scroll to the top?