I am thinking about implementing a "shop by brand" and "shop by category" using a tabbed menu. that is if click shop by brand tab brands are underneath, but if i click shop by category instead categories are underneath (without page reloading) so my question is how is this best implemented in a search engine friendly manner so that search engines (especially google) will not have trouble following these links or will not have any other SEO related issues. As I am about to have a developer start but want to make sure they implement the best way.