Hi Clive,
I've been curious if tabbing of the Seller Details would get a + or - response from buyers. It was a consideration for SophieBox Wildcat, so you'll have to let me know if that's well received. Sellers over here have been a little put-off with eBay tabbing the page, so I decided to keep that feature on hold for the moment. I'd listen to anyone with a need.
I might suggest that frame for the tab section be extended slightly to avoid scrollbar.
Danno