function bookmark(){
    var url = "http://www.cooterdump.com";
    var description = "cooterdump.com"; 
    var netscape="Please hit CTRL+D to add a bookmark to this site.";
    if (navigator.appName=='Microsoft Internet Explorer'){
        window.external.AddFavorite(url, description);
    }else if (navigator.appName=='Netscape'){
        alert(netscape); 
    }
}