The shop GanzNormal.ch has sort of a main menu containing of two items: "Produkte (Products)" and "Hersteller (Manufacturers)".
It is augmented using ARIA: aria-haspopup and aria-expanded.
I'm used to have ARIA on highly interactive JavaScript elements, but not on traditional links that do a page reload. So I think it's not ok to use those attributes for this menu, as it offers only traditional links.
I assume that the developers mainly searched for a way to convey the "selected/active" status of the items, but this isn't a proper way. I would assume the developers simply use a visually hidden text like "current item".
What do you think? Is it ok to set those ARIA attributes, or would it be better to remove them?
Live site: http://www.ganznormal.ch/index.cfm?&content=2010&navi=20&spr=de
Those two buttons are acting as tabs (or as a radio button group), you should mark them up in that way. You can use the aria-selected="true" attribute to indicate which tab is the selected tab.