Technique for implementing browser-initiated user-transparent network-distributed advertising and for interstitially displaying an advertisement, so distributed, through a web browser in response to a user click-stream

A technique for implementing in a networked client-server environment, e.g., the Internet, network-distributed advertising in which advertisements are downloaded, from an advertising server to a browser executing at a client computer, in a manner transparent to a user situared at the browser, subsequently displayed, by that browser and on an interstitial basis, in response to a click-stream genererated by the user to move from one web page to the next.