1. A computer-implemented method for determining at least one supplemental advertisement to be presented on an advertiser landing Web page, the advertiser landing page being referenced from a user selected advertisement, comprising: a) accepting, by a computer system including one or more computers on a network, advertiser policies provided by an advertiser associated with the advertiser landing Web page, the advertiser policies including 1) a condition that supplemental advertisements on the advertiser landing page must not include any links to another document, and 2) a condition that supplemental advertisements on the advertiser landing page advertise a different product or service than the product or service advertised in the user selected advertisement; b) accepting, by the computer system, search query information sourced from a user device; c) generating, by the computer system and for presentation on the user device, a document with search results determined using the search query information and at least one advertisement determined, by the computer system and using the search query information, wherein each of the at least one advertisement includes a reference to an advertiser landing Web page and wherein each of the at least one advertisement advertises a product or service; d) transmitting, by the computer system and to induce presentation on the user device, the generated document including the search results and the at least one advertisement; e) accepting, by the computer system, a selection, sourced from the user device, of one of the at least one advertisement; f) determining at least one supplemental advertisement, by the computer system, using 1) the search query information, and 2) the accepted advertiser policies including the condition that the at least one supplemental advertisement must not include any links to another document, and the condition that the at least one supplemental advertisement advertises a different product or service than the product or service advertised in the selected at least one advertisement; and g) generating, by the computer system and for presentation on the user device, the advertiser landing Web page referenced from the selected at least one advertisement, the advertiser landing Web page including the at least one supplemental advertisement determined by the computer system.
1. A computer-implemented method for determining at least one supplemental advertisement to be presented on an advertiser landing Web page, the advertiser landing page being referenced from a user selected advertisement, comprising: a) accepting, by a computer system including one or more computers on a network, advertiser policies provided by an advertiser associated with the advertiser landing Web page, the advertiser policies including 1) a condition that supplemental advertisements on the advertiser landing page must not include any links to another document, and 2) a condition that supplemental advertisements on the advertiser landing page advertise a different product or service than the product or service advertised in the user selected advertisement; b) accepting, by the computer system, search query information sourced from a user device; c) generating, by the computer system and for presentation on the user device, a document with search results determined using the search query information and at least one advertisement determined, by the computer system and using the search query information, wherein each of the at least one advertisement includes a reference to an advertiser landing Web page and wherein each of the at least one advertisement advertises a product or service; d) transmitting, by the computer system and to induce presentation on the user device, the generated document including the search results and the at least one advertisement; e) accepting, by the computer system, a selection, sourced from the user device, of one of the at least one advertisement; f) determining at least one supplemental advertisement, by the computer system, using 1) the search query information, and 2) the accepted advertiser policies including the condition that the at least one supplemental advertisement must not include any links to another document, and the condition that the at least one supplemental advertisement advertises a different product or service than the product or service advertised in the selected at least one advertisement; and g) generating, by the computer system and for presentation on the user device, the advertiser landing Web page referenced from the selected at least one advertisement, the advertiser landing Web page including the at least one supplemental advertisement determined by the computer system. 11. The computer-implemented method of claim 1 further comprising: accepting, by the computer system, an election by the advertiser associated with the advertiser landing Web page to allow the at least one supplemental advertisement to be rendered with the advertiser landing Web page; transmitting, by the computer system and to induce presentation on the user device, the advertiser landing web page referenced from the selected at least one advertisement and the at least one supplemental advertisement determined by the computer system; providing, by the computer system, compensation to the advertiser associated with the advertiser landing page for allowing the at least one supplemental advertisement to be rendered with the advertiser landing Web page.