function installSearchEngine() {
 if (window.external && ("AddSearchProvider" in window.external)) {
   // Firefox 2 and IE 7, OpenSearch
   window.external.AddSearchProvider("http://search.up.net/upnet.xml");
 } else if (window.sidebar && ("addSearchEngine" in window.sidebar)) {
   // Firefox <= 1.5, Sherlock
   window.sidebar.addSearchEngine("http://search.up.net/upnet.src",
                                  "http://www.up.net/favicon.ico",
                                  "up.net Search", "");
 } else {
   // No search engine support (IE 6, Opera, etc).
   alert("No search engine support");
 }
}