function installSearchEngine() {
 if (window.external && ("AddSearchProvider" in window.external)) {
    window.external.AddSearchProvider("http://www.dfebook.net/wp-content/themes/dpgame/bse-settings.xml");
 } else if (window.sidebar && ("addSearchEngine" in window.sidebar)) {
    alert('Sorry, we don\'t support Firefox 1.5.')
 } else {
   alert("Your browser has no search engine support.");
 }
}