13. The computer-implemented method of claim 1 , wherein the at least one advertiser document is a product Web page of an e-commerce Website, which Web page is arranged in a hierarchy defined by product categories.
13. The computer-implemented method of claim 1 , wherein the at least one advertiser document is a product Web page of an e-commerce Website, which Web page is arranged in a hierarchy defined by product categories. 15. The computer-implemented method of claim 13 , wherein offer information for an ad associated with a particular product Web page is inherited from an ancestor Web page.