This popup is generated for http://ebay0.112.2o7.net by the function function s_mr(un,sess,q,ta) of JavaScript file in base.js of eBay.
There are several possibilities, from editing hosts file (that seems to be crap), or deactivating JavaScript or Cookies or only eBay-Cookies... or deactivating the Webserver (Appache, IIS, ...) while surfing eBay.
However, the best way is to use AdBlock and block following:
http*://*.112.2o7.net/*
There'll be no more data-mining by Omniture while surfing eBay


(Hopefully everybody looking for solutions concerning that damn popup notices this topic!)