Right when I started building a template for use at eBay I went looking for a gallery type option for the pages. I ran across one that's javascript based and has you enter in item numbers of items to display in the gallery.
But... who wants to constantly be editing ad's and entering item numbers etc.
I'd imagine the javascript could be manipulated a bit to call eBays API directly. I've not really looked into the eBay API yet although I do have a developers tag there.
I'd guess the feed comes via Auctiva as it's probably alot faster than calling the eBay API direct for every listing a consumer might view. Maybe not
If its not done via Auctiva it should be.
As I noted, for a gallery scroller to really be at best effectiveness in upsell the merchant need use it to target similar items. Thus here sits an advertisement for Star Wars games. In the gallery we want show them more Star Wars games or Star Trek games or Space multimedia etc. We dont want them seeing, Sponge Bobs Big Race game.
Not knowing Auctiva's code model and structure I cant say whether it'd be easy or hard to implement. Optimally listing's should be able to be saved to "profiles" such as "Mens Shoes" etc. Then to set up a scroller one would have options such as "Get from profile" that would just randomly take other listings in the selected profile. Another where the vendor could select from any profile individual listings. That'd be the "basics" for more effective upsell.
One could of course go quite a bit further such as prioritization of profiles or listings. For example, perhaps in certain ad's (or all ads for that matter) the first things I'd like scrolled are my $1 auctions. I want them scrolled three times (as the buyer is reading my ad first not looking at the scroller), then after those three I want scroll in, "Mens Shoes" or specific listings.
If the scrollers just random then its true effectiveness cannot be realized.